Question

In: Statistics and Probability

1. Glucose levels in patients free of diabetes are assumed to follow a normal distribution with...

Glucose levels in patients free of diabetes are assumed to follow a normal distribution with a mean of 120 and a standard deviation of 16. What is the probability that the mean glucose level is LESS THAN 115 in a sample of 12 patients?

Group of answer choices

a.1.08

b.0.8599

c.0.1401

d.-1.08

2. I cant seem to find the right answer here

Group of answer choices

A.1.08

B.0.8599

C.0.1401

D.-1.08

3. Among coffee drinkers, men drink a mean of 3.2 cups per day with a standard

deviation of 0.8 cups. Assume the number of cups per day follows a normal distribution. If a sample of 20 men is selected, what is the probability that the mean number of cups per day is GREATER THAN 3 cups?

Group of answer choices

a.0.8686

b.-0.1314

c.0.1314

d.-1.12

If a 95% CI for the difference in two independent means is (-4.5 to 2.1), then which of the following is true? Make sure you completely read ALL of each choice below. The entire choice must be correct to be the right choice.

Group of answer choices

a.The confidence interval is (-4.5, 2.1); the first number is negative, and the second number is positive. Therefore, there IS a significant difference in means.

b.The confidence interval is (-4.5, 2.1), which overlaps 0. Therefore, there is NOT a significant difference in the two independent means.

c.The confidence interval is (-4.5, 2.1), which overlaps 0. Therefore, there IS a significant difference in two independent means.

d. The confidence interval is (-4.5, 2.1) which does NOT overlap 0. Therefore, there IS a significant difference in the two independent means.

If a 95% CI for the difference in two independent means is (-2.1 to 4.5), then which of the following is true? Make sure you completely read ALL of each choice below. The entire choice must be correct to be the right choice.

Group of answer choices

a. The confidence interval is (-2.1, 4.5) which does NOT overlap 0. Therefore, there is NOT a significant difference in the two independent means.

b.The confidence interval is (-2.1, 4.5), which overlaps 0. Therefore, there IS a significant difference in two independent means.

c. The confidence interval is (-2.1, 4.5), which overlaps 0. Therefore, there is NOT a significant difference in the two independent means.

d. The confidence interval is (-2.1, 4.5) which does NOT overlap 0. Therefore, there IS a significant difference in the two independent means.

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The solution to this problem is given by

orchestra answered 1 year ago

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