Question

For problems 9, 10, 11, and 12, solve the problems by answering a) State the claim (use a sentence), b) H., H, and place the claim with either one of the two. c) Test statistic, show and label the formula you use. d) Find critical value(s), and reject Ho or fail to reject Ho. You may use a p-value. e) Write a formal conclusion and final statement. 9. A parenting magazine reports that the mean number of phone calls teenage girls make per night is at least 4. A high school female student claims that the report is inaccurate and claims that that claim is less than reported. She asks 25 teenage girls at her high school, and calculates a mean of 3.4 calls per night with a standard deviation of 0.9 calls per night. Test the student's claim. Use a=0.01

​​​​​​​Please show hand written work for everything including formulas etc.

Answer 1

solution: - (9) a cramm - Mean number of phone calls teenage girl make night less thon 4 Ho: el 3, 4 Hall 24 c) Test statistic = 7-4: 3.9 9 = -3.333] 0.9 V25 d) tm.i,a = t24,0.01 =- SATARA - 2.492 Resection resign since, Test statistic fall im rejection region Resect He -2.492 es There is sufficient evidence to support the claim that mean number as phone calls teenage girl make per might is less than 4.