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Chrome File Edit View History Bookmarks People Window Help 41% D Tue 4:02 PM a ; Take a Test a Secure https://www.mathxl.com/Student/PlayerTest.aspx?testld-169415630&centerwin; yes F17 latestart M13A7 40492 Intro Statistics (T Th 3-6:15P) 2117 402 PM est: Chapter 6 Examm Thisstion: 1 pt Submit Test 170120 (2 complete) This Test: 20 pts possi Use the standard normal distribution or the t-distribution to construct a 99% oonfidence interva, or the populaton mean Just your decision r ne er dist nean be v In a recent season, the population standard deviation of the yards per carry for all unning backs was 1.31. The yards per carry of 25 randomly selected runing backs are 1.4 5.9 5.4 3.9 3.9 4.5 shown below. Assume the yards per cary are normally dariburted 5.8 7.5 3.4 4.7 7.4 6.1 1.5 2.9 2.6 4.7 3.1 3.6 3.8 3.9 Which distribution should be used to construct the confidence interval? A. o B. O C. 0 D. Use a normal distribution because n

Explanation / Answer

The statistical software output for this problem is:

One sample Z confidence interval:
: Mean of variable
Standard deviation = 1.31

99% confidence interval results:

Hence,

Distribution: Option B is correct.

99% confidence interval: (3.84, 5.19)

Interpretation: Option A is correct.

Variable n Sample Mean Std. Err. L. Limit U. Limit Data 25 4.516 0.262 3.8411327 5.1908673

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