A nutrition store in the mall is selling \"Memory Booster\" which is a concoctio

Question

A nutrition store in the mall is selling "Memory Booster" which is a concoction of herbs and minerals that is intended to improve memory performance. To test the hypothesized memory enhancement of the herbal mix, the now famous drug researcher, Dr. Mindfog, obtains a sample of 15 adult volunteers and has each person take the suggested dosage each day for 4 weeks. At the end of the four- week period, each individual takes a standardized memory test. In the general adult population, the standardized memory test is known to have a mean of = 10, where higher scores demonstrate better performance on the test of memory. The scores for the 15 volunteers are: 12, 11, 13, 15, 8, 11, 13, 15, 10, 9, 10, 16, 15, 11, 14 with = .01, determine the critical value of z* , t*, or r. that needs to be employed here. The value is: 0 641 2.58 O 2.624

Explanation / Answer

The sample is small so it would be a t test.

Degrees of freedom = n - 1 = 15 - 1 = 14

For 14 degrees of freedom and 0.01 level of significance,

Critical t* value = 2.624

Option C is correct.

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