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Practice Part 3 1. What is the appropriate critical value for each of the following confidence levels and sample sizes? (Rem in regard to confidence

Need help with statistics problems.  Thanks in advance.

Practce ParT 3 1. (a) (b) 2 3. (a) Determine the mean and standard deviation of this sample data. (b) (c) Determine the 95% confidence interval for the mean download time all iPads. (d) State your final confidence interval result in a sentence that interprets the result within the co What is the appropriate critical value for each of the following confidence levels and sample s in regard to confidence level this implies two-tails) Critical z -value for an 98% confidence level for sample of size n = 43: Critical t -value for a 95% confidence level for sample of size n =27: Suppose that the population standard deviation is not known. Under what condition, you can the inferences about the population mean? Apple iPad engineers would like to know the mean time for movie downloads. They calculate for a specific movie by 12 randomly selected iPads, and the data is shown to the right. Assum normally distributed Determine the expected margin of error amount in using this sample result to estimate the m this same movie of all Apple iPads based upon a 90% desired level of confidence.
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4. Answer the following: (a) What is the meaning of the term “null hypothesis” in statistics. (b) In multiple choice problems 5 and 6, select the best answer. 5. A. Fail to reject the null hypothesis B. Claim the null hypothesis is true C. Reject the null hypothesis D. Claim the alternative hypothesis is false 6. A. Fail to reject the null hypothesis B. Claim the null hypothesis is true C. Reject the null hypothesis D. Claim the alternative hypothesis is false 7. 8. (a) Give the null and alternative hypotheses for this situation in mathematical notation. How do you know when to perform a “left-tailed” test in a hypothesis-testing situation versus a tailed” test? A statistical hypothesis test is used to test a claim. You get 1.65 as the test statistic from the critical value in a right-tailed test. Which of the following is the correct decision statement for A statistical hypothesis test is used to test a claim. You get a P-value of 0.023 on a test with following is the correct decision statement for the test? The posted speed limit on Interstate 30 near New Mexico is 75 miles per hour, but it is claime actual speeds of vehicles is greater than 75 miles per hour. Describe the Type II error you co this claim through a formal hypothesis test on collected data. The posted speed limit on Interstate 30 near New Mexico is 75 miles per hour, but it is claime actual speeds of vehicles is greater than 75 miles per hour. To test this claim, the speeds of 4 vehicles were taken and then reported to the right.
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Practice3 (1).xlsx

Practice Part 3 1. What is the appropriate critical value for each of the following confidence levels and sample sizes? (Rem
implies two-tails)
(a) Critical z-value for an 98% confidence level for...

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