ConclusionJerry's scored a 95 on an AP Statistics test is 99.27 percentile score. Jerry's scored a 90 on an AP History test is 96.63 percentile score

Find a z* for a 93% confidence interval using Table A or your calculator. Show your method Sol-

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31 May 2023

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Related questions

Module 4 Minitab Assignment

Instructions:

Below you will find questions. Please use the provided data to complete the tasks and to answer the questions.

For the standard normal distribution, Z, find the proportion (percentage) of observations that satisfies each of the following statements. In each case, use a graph of the Normal curve and shade the area under the curve that is the answer to the question.

Values of z larger than 2.33.

Between z = −1.50 and z = 1.18.

Values of z less than 1.19.

A set of final examination grades in an introductory statistics course was found to be normally distributed with a mean of 77 and a standard deviation of 8. For each of the following produce a normal distribution plot showing the appropriate shaded area.

What percentage of students scored lower than 70 on this exam?

What percentage of students scored between 81 and 89?

What percentage of students scored higher than 90 on this exam?

What is the 80th percentile of scores?

What is the 95th percentile of scores?

sbmrgd

1. Mr. Jones is interested in determining how long it takes his students to write essays for his class.

The table below shows the mean and standard deviation for the length of time to write an essay (in minutes) for a random sample of 20 AP Statistics students and a random sample of 25 physics Honors students. (These are from all students he has had through the years)

Based on the histogram of the data, it is not unreasonable to assume the distribution of essay times is approx normal.

a. Estimate the mean difference in essay completion times for all AP Statistics and Physics Honors students In Mr. Jone's classes.

b. Based only on this confidence interval, do you think the difference in the mean wait times is statistically significant? Justify your answer.

orangeraven661

I need help conducting a z-test for my assignment. The question states, "You want to determine if Canadians are nicer (less rude) than Americans. Americans 'niceness' score is µ=2.4 with a standard deviation of 1.6. You get a sample of n=36 Canadians to complete the same niceness questionnaire. You calculate descriptive statistics for your sample as M=2.9 and s=1.9. As this is exploratory research, use an alpha of .10. Conduct a z-test on the information above. Make sure to note: 1.) the formula, 2.) the null and alternative hypothesis, 3.) the critical value, 4.) calculate the result (show calculation in case of error), 5.) What is the statistical decision, 6.) What does this mean in plain english?"

Thanks for the help!