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Organizing Data

Probability Concepts

The Nature Of Statistics

High School Statistics Questions asked by Filo students

Question 101

Views: 5,863

03/13/236 : 1

Question 10, 5.4.31-T, HW Score:

81.82%, 9

of 11 points Part 1 of 2 (x) Points: 0 of 1 ercent of childhood asthma prevalence in 43 cities is

2.39%

. A random sample of 34 of these cities is selected. What is the probability that the mean childhe or the sample is greater than

2.7%

? Interpret this probability. Assume that

σ = 1.33%

. is ur decimal places as needed.)

Topic:

Confidence Intervals for One Population Mean

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Question 102

Views: 5,836

2) Suppose the contents of both bags from question I are put in the same bag and Iwo marbles are drawn without replacement: (Please use your ID letier and refer to the Data Sheet for you marble quantities) a) What is the probability that both marbles are white?

\frac{7}{24} + \frac{7}{23} = \frac{5%}{52} = 0, 10 ∣

b) What is the probability that neither marble is red? c) What is the probability that the first marble is red and the second marble is green?

Topic:

Probability Concepts

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Question 103

Views: 5,831

3) A survey was done where a random sample of people 18 and over were asked if they preferred comedies, dramas, or neither. The information gathered was broken down by age group and the following contingency table was made. (Please use your ID letter and refer to the Data Sheet for your table quantities) A person is selected at random. a) Determine the probability that they prefer Dramas given they are age 25-34. b) Determine the probability that they are age 18-24 given that they prefer Comedies. c) Determine the probability that they are age 35 and older or prefers Dramas

Topic:

Probability Concepts

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Question 104

Views: 5,732

4) Consider a class of 38 students. The student names are placed in a hat and 4 names are randomly drawn without replacement. a) If the first person drawn was named the class president, second person drawn was named vice president, third person drawn was named secretary, and the fourth person drawn was named treasurer how many different results would be possible? b) If the four names drawn constituted a committee, how many different committees would be possible? c) If the class of 38 students consisted of 20 men determine the probability that all four students randomly selected were men.

Topic:

Probability Concepts

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Question 105

Views: 6,039

In Shen's cooler there are 7 botties of soda and 6 botties of water. Shen is going to choose 7 bottles at random from the cooler to give to his friends. What is the probability that he will choose 5 sodas and 2 waters? Round your answer to three decimal places.

Topic:

The Nature of Statistics

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Question 106

Views: 5,252

Given the following data for four houses sold in comparable neighborhoods and their corresponding number of square feet, find a linear regression oquation that best fits the data Use the equation to predict the selling price of a house with 2700 square feet The linear regression equation is

y =

(Round values to two decimal places)

Topic:

The Nature of Statistics

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Question 107

Views: 5,183

Read each sentence. Decide if the underlined noun is a subject or an object. Write subject or object on the line.

The boys both enjoy sports.
Dan has other interests, too.
He is an excellent drummer.
Dan decides to join the jazz band.
He meets new friends.
They do not know Bruce.

Topic:

The Nature of Statistics

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Question 108

Views: 5,798

Tamele uculí Evaluating Variable Ixprescions Evaluate eacbiatag the values given: 1)

n^{3} - m;

m = 7

n = 1

xx + 2;

x = 7

y = 2

m = n + 4

m - 5

n = 8

7 N

x - y + 6;

x = 6

y = 1

z + z^{'}

x = 1

z = 19

y + y x

x = 15

y = 8

q + 6 + p

p = 10

q = 12

x + 8 - y

x = 20

y = 17

15 - (m + p)

m = 3

p = 10

10 - x + y \div 2

x = 5

y = 2

p - 2 + qp

p = 7

q = 4

Topic:

The Nature of Statistics

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Question 109

Views: 5,592

20 Cybersecurity survey. The information systems organiz. tion. ISACA, conducts an annual survey of cybersecurity at firms from around the world. ISACA sends survey questionnaires via email to all professionals that hold ISACA's Certified Information Security Manager desig. nation. Over 1,500 professionals participated in the 2015 cybersecurity survey, of which 766 responded to a question on whether or not they expect to experience a cyberattack (c.g., a Malware, hacking, or phishing attack) against their firm in the coming year. About

82%

of the respondents expect to experience a cyberattack during the year (State of Cybersecurity: Implications for 2015, ISACA and RSA Conference Survey).

Identify the population of interest to ISACA.
Identify the data-collection method used by ISACA. Are there any potential biases in the method used?
Describe the variable measured in the ISACA surve it quantitative or qualitative?
What inference can be made from the study result?

Topic:

Descriptive Measures

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Question 110

Views: 5,326

5) The following frequency table represents the frequency distribution of lengths (in inches) of 25 Brook Trout from a pond. (Please use your ID letter and refer to the Data Sheet for your frequencies) A single Brook Trout is randomly selected from the pond. Determine the probability that: a) It is between 8 and 19 inches long. b) Its length is 11 inches or less.

Topic:

Probability Concepts

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Question 111

Views: 5,727

6) As of October 2012, approximately

68%

of all American households had high-speed internet access. Consider a random sample of 50 American households from 2012 . Assuming that each house has a

68%

chance of having high-speed intemet access and that the results are independent determine... a) (3 points) The probability that exactly 31 of the 50 American households have high-speed intemet access. b) (4 points) The probability that between 32 and 35 American households inclusive have high-speed internet access. (i.e. at least 32 but no more than 35 American households) c) ( 3 points) What is the mean and standard deviation of this random variable?

Topic:

Probability Concepts

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Question 112

Views: 5,578

7) Al a local hospital historical records were kept on the number of times a specific CT Scanner was serviced in a given year. Using this information, a probability distribution was created letting the random variable

x

represent the number of times the CT Scanner was serviced in a yearlong period. (Please use your ID letter and refer to the Data Sheet for your probabilities) (Note: There has never been a year that the CT Scanner was serviced more than 4 times) As the hospital administrator, you decided to use this probability distribution to predict the number of times the CT Seanner will be serviced over the next year. Based on this information determine... a) (3 points) The probability that over the next year the CT Scanner will need to be serviced two times or less. b) (4 points) Determine the mean and standard deviation of this random variable. c) (3 points) Given that it costs the hospital \ 800$ each time the CT Scanner is serviced pleas determine the average servicing cost the hospital can expect to incur from this scanner ov the next year (for budgeting purposes).

Topic:

Probability Concepts

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Question 113

Views: 5,389

S.ake Ihewe has mevor Non a yoar that the c* I Soanmer was serviced more than 4 times) As Le Aospial alministrater, you sheidol to use this probability distribution to prediet the man of fims the CT Scanner will be serviced over the nexl year. llased on this information a)

(3

peund) The probabality that over the nevi year the CT Scanner will necd to be scrviced \[ \begin{aligned} P(0) \cdot f(1) & \cdot 2 \\ & 15+3+.31=[a . A] \end{aligned} \] b) (4 points) Determine the mean and standard deviation of this mandom variable. c) (3 points) Given that it costs the bospital \ 800$ each time the CT Scanner is serviced please determine the average servicing cosi the hospital can expect to incur from this scanner over the next year (for budgeting purposes).

Topic:

Probability Concepts

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Question 114

Views: 5,334

Write the following ratio using two other notations.

9 to 7

Use only the numbers above (not any others). Notation one: Notation two:

\times 5

Topic:

The Nature of Statistics

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Question 115

Views: 5,520

In the New York State Lottery there is a game called Win 4. The object of the game is to select, in order, each of the correct four single digit numbers

0 - 9

on the random drawing (i.e. each of the 4 numbers will be drawn independently and will result in a 4 digit number from 0000 to 9999 which you must get the numbers in the correct order to win). Suppose you want to play the Win 4 game the next day but decide to scek out a fortune teller to give yourself a litte "advantage" to the next day's drawing. The fortune teller, who is never wrong, says they will give you "part" of the information of the next day's drawing and gives you two choices of what information they will give you... Choice 1: The fortune teller will give you the first two numbers (in the correct order) and will tell you whether the third and fourth numbers are even or odd ( 0 will be considered even for this purpose). So for example the fortune teller could say The first number is 3 The second number is 8 The third number is even The fourth number is odd Choice 2: The fortune teller will give you all four numbers but not necessarily in the correct order. So for example the fortune teller could say the numbers are 3,8,5, and 1 where the actual winning number would be one arrangement of those numbers. Of the two above choices which one would result in the best chance of winning the next day's Win 4 game? You must support your answer with a mathematical reasoning of why your choice is the correct one (i.e. show that it has the better probability of success).

Topic:

Probability Concepts

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Question 116

Views: 5,278

A student ran out of time on a multiple choice exam and randomly guessed the answers for two problems. Each problem had 4 answer choices -

a, b, c, d

- and only one correct answer. What is the probability, that he answered both of the problems correctly? Do not round your answer.

Topic:

The Nature of Statistics

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Question 117

Views: 5,759

On each trial of an experiment, a subject is presented with a constant soft noise, which is interrupted at some unpredictable time by a noticeably louder sound. The time it takes for the subject to react to this louder sound is recorded. The following list contains the reaction times (in milliseconds) for the 18 trials of this experiment:

202, 217, 231, 257, 186, 269, 235, 226, 311, 175, 271, 212, 261, 152, 250, 236, 273, 229

Send data to calculator Find

2 5^{th}

6 0^{th}

percentiles for these reaction times. (a) The

2 5^{th}

□

milliseconds (b) The

6 0^{th}

□

Topic:

The Nature of Statistics

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Question 118

Views: 5,877

On each trial of an experiment, a subject is presented with a constant soft noise, which is interrupted at some unpredictable time by a noticeably louder sound The time it takes for the subject to react to this louder sound is recorded. The following list contains the reaction times (in milliseconds) for the 18 trials of this experiment:

202, 217, 231, 257, 186, 269, 235, 226, 311, 175, 271, 212, 261, 152, 250, 236, 273, 229

Send data to calculator Find

2 5^{th}

6 0^{th}

percentiles for these reaction times. (a) The

2 5^{th}

□

milliseconds (b) The

6 0^{th}

Topic:

The Nature of Statistics

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Question 119

Views: 5,264

Here is a table showing all 52 cards in a standard deck. Face cards Suppose one card is drawrit rat random from a standard deck. (a) Find the odds against drawing a black king. (b) Find the odds in favor of drawing a face card.

Topic:

The Nature of Statistics

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Question 120

Views: 5,309

Which of the following is true? Select all that apply. A Know Simple query answered in the snippet of a WSRB is Fully Meets Web Search Result Blocks (WSRB) are rated based on the content of the Landing Page A Know Simple query answered in the title of a Landing Page is Fully Meets A Know Simple query can never receive a Fully Meets rating Submit

Topic:

Organizing Data

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