In Izmir University of Economics, a statistics instructor is interested in the ability of students to assess the difficulty of a test they have taken in the statistic course. This test was taken by a large group of students in the course, and the average score was 76.3. A random sample of eight students was asked significance level. predict this average score. Their predictions are shown below. Assuming a normal distribution, test the null hypothesis that the population mean prediction would be 76.3. Use a two-sided alternative and a 10% 78 83 73 69 65 72 81 71 D Click the icon to view the upper critical values of the Student's t distribution, " s/Jn 'n-1a x-Ho O B. Reject H, if s/ yn メーPO OC. Reject H, if x-Ho >4-1a/2 s/ yn <-4-19/2 or reject H, If Determine the value(s) for -t,-1a ,-1a or 2t-1a/2 as appropriate for this test. (Round to three decimal places as needed. Use a comma to separate answers as needed.) Calculate the decision statistic. x-Po =(Round to three decimal places as needed.) s/ yn State the conclusion of this test. the null hypothesis. There v sufficient evidence that the population mean prediction is not equal to 76.3. Reject swer(s). Do not reject

In Izmir University of Economics, a statistics instructor is interested in the ability of students to assess the difficulty of a test they have taken in the statistic course. This test was taken by a large group of students in the course, and the average score was 76.3. A random sample of eight students was asked significance level. predict this average score. Their predictions are shown below. Assuming a normal distribution, test the null hypothesis that the population mean prediction would be 76.3. Use a two-sided alternative and a 10% 78 83 73 69 65 72 81 71 D Click the icon to view the upper critical values of the Student's t distribution, " s/Jn 'n-1a x-Ho O B. Reject H, if s/ yn メーPO OC. Reject H, if x-Ho >4-1a/2 s/ yn <-4-19/2 or reject H, If Determine the value(s) for -t,-1a ,-1a or 2t-1a/2 as appropriate for this test. (Round to three decimal places as needed. Use a comma to separate answers as needed.) Calculate the decision statistic. x-Po =(Round to three decimal places as needed.) s/ yn State the conclusion of this test. the null hypothesis. There v sufficient evidence that the population mean prediction is not equal to 76.3. Reject swer(s). Do not reject

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Description: In Izmir University of Economics, a statistics instructor is interested in the ability of students to assess the difficulty of a test they have taken in the statistic course. This test was taken by a large group of students in the course, and the av

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey 8 employees. The number of sick days they took for the past year are as follows: 10; 5; 13; 3; 11; 8; 6; 9. Let X = the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10? Conduct a hypothesis test at the 5% level.Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption, though.) What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) t = Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence…
Which of these scenarios means that a pretest-posttest design with a non-equivalent control group is not suitable? Select all that apply. O a. All of the available participants will be receiving the intervention at the same time. O b. Authors want to examine for any trends in the data over time. O c. The participants were placed into the experimental and control groups by natural circumstances rather than random assignment. O d. Authors want to compare averages between two groups before and after the intervention using an ANOVA.
Insurance Company A claims that its customers pay less for car insurance, on average, than customers of its competitor, Company B. You wonder if this is true, so you decide to compare the average monthly costs of similar insurance policies from the two companies. For a random sample of 7 people who buy insurance from Company A, the mean cost is $150 per month with a standard deviation of $16. For 12 randomly selected customers of Company B, you find that they pay a mean of $160 per month with a standard deviation of $14. Assume that both populations are approximately normal and that the population variances are equal to test Company A's claim at the 0.10 level of significance. Let customers of Company A be Population 1 and let customers of Company B be Population 2. Step 2 of 3: Compute the value of the test statistic. Round your answer to three decimal places.
Insurance Company A claims that its customers pay less for car insurance, on average, than customers of its competitor, Company B. You wonder if this is true, so you decide to compare the average monthly costs of similar insurance policies from the two companies. For a random sample of 13 people who buy insurance from Company A, the mean cost is $150 per month with a standard deviation of $19. For 9 randomly selected customers of Company B, you find that they pay a mean of $157 per month with a standard deviation of $16. Assume that both populations are approximately normal and that the population variances are equal to test Company A's claim at the 0.05 level of significance. Let customers of Company A be Population 1 and let customers of Company B be Population 2. Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Ho: M₁ = μ₂ Ha:M₁ •H₂
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