Question

A special diet is intended to reduce cholesterol level. If the diet is effective, the target is to have the average cholesterol level of this group be below 150. After six months on the diet, an SRS of 28 patients with high cholesterol level had an average cholesterol of = 143, with standard deviation s = 21. Is this sufficient evidence that the diet is effective in meeting the target? Assume the distribution of the cholesterol level for patients in this group is approximately Normal with mean μ. Based on the data, the value of the one-sample t statistic is.
A.0.33
B.1.76.
C.–1.76.
D.-0.33

Answer 1

i chose c. am i correct?

Answer 2

Yes.

Answer 3

what would the appropriate hypothesis be
A.H0: μ = 150, Ha: μ > 150.
B.H0: μ = 150, Ha: μ < 150.
C.H0: μ = 143, Ha: μ ≠ 143.
D.H0: μ = 150, Ha: μ ≠ 150.
i was thinking d

Answer 4

actually reading it again i would have chose b. am i correct?

Answer 5

Stick with one answer. Which one do you think it is?

Answer 6

d

Answer 7

ok. Why do you say it's d?

Answer 8

because it is testing cholesterol and would like it to be below 150 but it could definately be above 150 so therefore would be a two sided test

Answer 9

The first one that you posted, does that go with the hypotheses?

Answer 10

C. H0: μ = 143, Ha: μ ? 143.

Answer 11

That's what the answer is!

Answer 12

wait why 143?

Answer 13

You are switching up your answers. First you said it was c. Which you were right! How about let me ask you, why is it 143. Can you tell me why?

Answer 14

no the first question was to find the tvalue which i did 143-150/21/the squared deviation of 28 and got -1.76. but i wasnt thinking that was the appropriate hypothesis. im sorry im so lost in statistics