Filters

Home

CBSE

Class 12

Statistics

Class 12 Statistics Questions asked by Filo students

Question 1

What's one problem with being in a filter bubble?

It becomes very difficult to do in-depth research on a particular topic.
The algorithms that control search engines and social media feeds stop working.
News sites might hide posts or stories they don't think you'll be interested in.
You can become overwhelmed with too much information on many topics at once.

Topic:

Statistics

View solution

Question 2

The average price of a college math textbook is

176 an d t h es t an d a r dd e v ia t i o ni s

20. Suppose that 11 textbooks are randomly chosen. Round all answers to 4 decimal places where possible.

Topic:

Statistics

View solution

Question 3

Texts: The calories in a Serrano burrito are distributed normally, with a mean of 820 calories and a variance of 900 square calories. 1. What is the probability that you'll order a burrito that has 790 calories or more? (If your answer is 23.5%, enter 23.5 as your answer, do not enter 0.235 or 23.5%) 2. Bryan works at Serrano, and he is currently being monitored closely by his superiors: they're worried he's being too generous with his burritos. Suppose 100 of his burritos are randomly sampled, and it is found that they contained an average of 827.5 calories with a sample standard deviation of 30 calories. What is the t-statistic associated with the test of the null hypothesis that Bryan's burritos are average in terms of the number of calories they contain, defining "average" to be 820 calories? 3. Would you reject or fail to reject the null hypothesis (from #2) for a critical value of 𝛼 = 0.05?

Topic:

Statistics

View solution

Question 4

Text: It is assumed that the body mass index (BMI) of all American young men follows a Normal distribution with a standard deviation σ = 11.6 kg/m². How large a sample would be needed to estimate the mean BMI μ in this population to within ±1 with 95% confidence?

Topic:

Statistics

View solution

Question 5

Question content area top Part 1 Use the normal distribution of SAT critical reading scores for which the mean is 504 and the standard deviation is 125. Assume the variable x is normally distributed. What percent of the SAT verbal scores are less than 650? If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 550?

Topic:

Statistics

View solution

Question 6

Texts: A new competitive video game, WreckerTrucks, developed at Gamer Hub, exhibits performance scores among all of its users that follow a normal distribution, with an average score of 50 points and a standard deviation of 10 points. The game development team is currently exploring a new game feature that could improve player performance by 2 points. (a) If we study a random sample of WreckerTruck gamers to test the effect of this new feature, what is the estimated power of the study (α = 0.05)? Show each step of your work! (b) What sample size would be sufficient to achieve a power of 0.99 for a one-tailed hypothesis test (α = 0.05)?

Topic:

Statistics

View solution

Question 7

Texts: 2. Determine the t critical value for a two-sided confidence interval in the following situation: Confidence level = 95%, df = 15? t.025, 12 = 2.179 t.025, 15 = 2.131 t.005, 20 = 2.845 t.005, 7 = 3.499

Topic:

Statistics

View solution

Question 8

Use a two-proportion Z-test to determine if the proportion of people who responded positively to the medicine is different between the two groups. On one sample of 200 people, 130 people responded positively, and on another sample of 100 people, 50 people responded positively to the medicine. Upload your results and Plot Chart as proof with your explanation.

Topic:

Statistics

View solution

Question 9

Texts: For each question, do not simply provide an answer; make sure you explain how you arrived at that answer. 1. ESP: For several years, the U.S. General Social Survey asked subjects, "How often have you felt as though you were in touch with or connected with someone when they were far away from you?" Of 3887 sampled subjects who had an opinion, 1407 said never and 2480 said at least once. a. Describe the population of interest. b. Calculate the descriptive statistics (sample proportions). c. What is the population parameter we want to draw conclusions about (make an inference about)? 2. Use critical thinking to develop an alternative conclusion. A study shows that the number of reported sexually transmitted diseases was significantly higher for high schools that offered courses in sex education than for high schools that did not. Conclusion: The introduction of sex education courses at the high school level has resulted in increased promiscuity among teens. 3. An engineer is designing a machine to manufacture gloves and she obtains the following sample of hand lengths (mm) of randomly selected adult males based on data gathered: 173 179 207 158 196 195 214 199 a. Define this data set as discrete or continuous. b. Hand lengths are what type of level of measurement? c. Compare the mean and median for this data set and if you can draw any conclusions from these values. 4. Explain the difference between stratified and cluster sampling. Why do you think that cluster sampling is frequently used in practice?

Topic:

Statistics

View solution

Question 10

If a population with = 60 and = 8 is transformed into z-scores, then the resulting distribution of z-scores will have a mean of ___________ .please explan the steps

Topic:

Statistics

View solution

Found the solution, but did not understand the concept?

Connect with a tutor in less than 60 seconds 24x7

Ask my first question

Question 11

A game has a red coin and a green coin. The red coin has a 3 on one side and a 4 on the other side. The green coin also has a 3 on one side and a 4 on the other side. In the game, one player flips the red coin and another player flips the green coin. Let random variable X represent the face value of the red coin MINUS the face value of the green coin. Determine the probability density function f(x) for X

Topic:

Statistics

View solution

Question 12

Assume we are playing a poker game. There are total 52 cards and 5 cards are taken out randomly. Five cards with distinct consecutive values, and not of the same suit are defined to be a straight. Calculate the probability that the five cards taken out randomly is a straight.

Topic:

Statistics

View solution

Question 13

Determine the critical value that must be used to construct a 94% confidence interval for a population mean with a sample size of 15. Round your answer to two decimal places.

Topic:

Statistics

View solution

Question 14

In a one-way ANOVA, the three calculated sums of squares are as follows: SSc = 13.78, SSe = 50.67, SSt = 64.44. The calculated degrees of freedom are: dfc = 2, dfe = 15. Using this information, calculate the f score.

1.56
2.78
2.04
2.90

Topic:

Statistics

View solution

Question 15

5. (10 points) A study published in Marine Mammal Science (Apr. 2010) investigated the type of net most likely to entangle a certain species of whale inhabiting the East Sea of Korea. A sample of 207 entanglements of whales in the area formed the data set for the study. These entanglements were caused by one of three types of fishing gear: set nets, pots, and gill nets. One of the variables investigated was body-length (in meters) of the entangled whale. An ANOVA F-test will be performed. a) Clearly write out the hypotheses for determining whether the average body length of entangled whales differs for the three types of fishing gear. Ho: Ha: b) The ANOVA F-test yielded F = 34.81, p < 0.0001. Interpret the results at 95% confidence. (Draw a conclusion.)

Topic:

Statistics

View solution

Question 16

A refrigerator costs an appliance store $1798. The appliance store marks up the refrigerator 31% of the cost. How much is the selling price for this refrigerator at the appliance store? Round solution to the nearest penny.

Topic:

Statistics

View solution

Question 17

1. Find an example for the binomial model with p=0.4 and n=10. 2. What are the PMF and CDF of your model in Question-1?

Topic:

Statistics

View solution

Question 18

The scores on a university examination are normally distributed with a mean of 62 and standard deviation of 11. If the Botton 10% of students are given F's, what is this score?

Topic:

Statistics

View solution

Question 19

Confidence intervals and p-values are commonly used in business decision making. Using the CSU-Global Library, identify at least two business journals (or articles) that have used confidence intervals and/or p-values. For each journal (or article), describe: 1. Journal/Article 1: - Problem Statement: The article aims to analyze the impact of marketing campaigns on sales revenue for a specific product. - Parameter(s) of Interest: The parameter of interest is the mean increase in sales revenue as a result of the marketing campaigns. - Conclusion and/or Decision: The article concludes that the marketing campaigns have a statistically significant positive effect on sales revenue. The decision is to continue investing in similar marketing campaigns. - Sample Size: The sample size is 500. 2. Journal/Article 2: - Problem Statement: The journal investigates the relationship between employee satisfaction and customer loyalty in the service industry. - Parameter(s) of Interest: The parameters of interest are the correlation coefficient between employee satisfaction and customer loyalty, as well as the mean difference in customer loyalty scores between satisfied and dissatisfied employees. - Conclusion and/or Decision: The journal concludes that there is a strong positive correlation between employee satisfaction and customer loyalty. Additionally, it is found that satisfied employees have significantly higher customer loyalty scores compared to dissatisfied employees. The decision is to prioritize employee satisfaction initiatives. - Sample Size: The sample size is 200. In addition, state the sample size. If they are using a confidence interval, state the confidence level and margin of error. If they are using the p-value, state the hypotheses, p-value, and level of significance.

Topic:

Statistics

View solution

Question 20

Assume that women's heights are normally distributed with a mean given by 64.2 in, and a standard deviation given by 2.2 in.

(a) If 1 woman is randomly selected, find the probability that her height is less than 65 in.
(b) If 30 women are randomly selected, find the probability that they have a mean height less than in.
(a) The probability is approximately enter your response here. (Round to four decimal places as needed.)
Part 2(b) The probability is approximately enter your response here. (Round to four decimal places as needed.)

Topic:

Statistics

View solution

1 2 3 4 5 6...4082

Get instant study help from an expert tutor 24/7

Download Filo

Filters

Filters

class

subject

topic

Class 12 Statistics Questions asked by Filo students

Found the solution, but did not understand the concept?

Ask my first question