Reference no: EM1321085

Question: In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75.  To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn & computed the sample mean number of calories per serving to be 78 with a sample standard deviation of seven.

[A] Calculate the z or t value of the sample test statistic. 

[a]   z = 1.916

[b]   t = -1.916

[c]   t = 1.916

[d]   z = 1.645

[B] State the null & alternative hypotheses.

[A]   H0: µ ≥ 75, H1: µ < 75

[B]   H0: µ = 75, H1: µ > 75

[C]   H0: µ = 75, H1: µ ≠ 75

[D]   H0: µ ≤ 75, H1: µ > 75