Please Help! Professor is old and can barely explain things. Step 1: Nonexercise
ID: 3222189 • Letter: P
Question
Please Help! Professor is old and can barely explain things.
Step 1: Nonexercise activity thermogenesis NEAT) provides a partial explanation for the results you found in the previous analysis. NEAT is energy burned by fidgeting, maintenance of posture, spontaneous muscle contraction, and other activities of daily living. In the study of the previous exercise, the 16 subjects increased their NEAT by 328 calories per day, on average, in response to the additional food intake. The standard deviation was 256. Test the null hypothesis that there was no change in NEAT versus the two-sided alternative. Summarize the results of the test and give your conclusion. eBook O The data provides clear evidence in favor of a change in NEAT. The P-value is o.00012. O The data do not support the claim that there was a change in NEAT, since the P-value is greater than 0.05. O It can be concluded at the 0.00001 level that there was a change in NEAT. O The data do not suggest that there was a change in NEAT, since the P-value is less than 0.0002.Explanation / Answer
a) sample mean, X = 328, sample standard deviation, s = 256
degree of freedom, df = n-1 = 16-1 = 15
t = (X-µ)/(s/sqrt(n)),
=(328-0)/(256/sqrt(16)) = 5.125
p = 0.00012
option A
b) At significance level (100%-95%) 0.05, critical t is
tcrit = 2.1314
Margin of error, ME = tcrit*(s/sqrt(n)) = 2.1314*(256/sqrt(16)) = 136.4096 = 136.4
95%CI is (328-136.4, 328+136.4) = (191.6, 464.4)
Option A
c) Option A, as the confidence interval talks about interval in which the mean increase falls with 95% confidence. It is not about other percentages as mentioned in the other options.