Question

Multiple Choice Questions

5. Which of the following is not a condition of the binomial distribution?

1. Only 2 possible outcomes
2. Have a constant probability of success
3. Must have at least 3 trials
4. Trials must be independent

6.The boundaries of a confidence interval are called:

(a) Confidence levels

(b) The test statistics

(c) The degrees of confidence

(d) The confidence limits

7.What value of z would you use to calculate the 98% confidence interval for a population mean, given that you know the population standard deviation, the sample size and the sample mean of your sample?

a) z = 1.96

b) z = 2.58

c) z = 1.28

d) z = 2.33

8.A 95% confidence interval for the population mean is calculated to be 75.29 to 81.45. If the confidence level is reduced to 90%, the confidence interval will:

a) Become narrower

b) Remain the same

c) Become wider

d) Double in size

Answer 1

5)c) must have atleast 3 trials

is not a condition for binomial distribution

6)the boundaries of confident intervals are called

d) confidence limits

7)The value of z would we use to calculate the 98% confidence interval for a population mean, given that we know the population standard deviation, the sample size and the sample mean of your sample is

D) 2= 2.33

8)

95% confidence interval for the population mean is calculated to be 75.29 to 81.45. If the confidence level is reduced to 90%, the confidence interval will:

a) Become narrower

as the confidence interval is being reduced , so the interval will too shrink