Question

The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day. An article reports the following summary data on intake for a sample of males age 65-74 years: 2 = 111, x = 12.8, and $ = 6.70. Does this data indicate that average daily zinc intake in the population of all males age 65-74 falls below the recommended allowance? (Use a = 0.05.) State the appropriate null and alternative hypotheses. Horft = 15 H: 14 5 15 O Hoa Hall> 15 Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P- value to four decimal places.) z = 3.46 P-value = 0.0000

Answer 1

The statistic software output for this problem is:

One sample Z summary hypothesis test: H: Mean of population Ho : p = 15 HA : H < 15 Standard deviation = 6.7 Hypothesis test results: Mean n Sample Mean Std. Err. P-value Z-Stat 111 12.8 0.63593586 -3.4594684 0.0003

z = -3.46

P-value = 0.0003