1)Given a lower bound of 525/1000 and and upper bound of 675/1000 then complete the following: (round to 3 decimal places)

p ^ E = --------------------

2) The t critical value varies based on (check all that apply)

the confidence level

the sample standard deviation

the sample mean

the sample size

3 ) The weights of a random sample of 11 female high school students were recorded. The mean weight was 110 pounds and the standard deviation was 17 pounds. If the sampling distribution is known to be approximately normal, then what must be true?

a) By the central theorem, the population distribution must have been normally distributed in order for the sampling distribution to have an approximate normal distribution.

B) By the central limit theorem, the population distribution must have been uniformly distributed.

c) By the central theorem, a sample size of 11 is considered to be sufficiently large to assume the sampling distribution is approximately normal.

d) By the central limit theorem, the population distribution must have been skewed to the left.

4) What effect does the confidence level have on the width of a confidence interval?

A) As the confidence level increases, the width of the interval gets narrower.

b) Changing the confidence level will have no effect on the width of the interval.

c)As the confidence level decreases, the width of the interval gets wider.

d)As the confidence level increases, the width of the interval gets wider.