this assignment is due in 20 mins anyone that is good at math?

Question 1

1. Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 98% confidence; the sample size is 800, of which 40% are successes

A.

0.0339

B.

0.0446

C.

0.0403

D.

0.0355

1 points

Question 2

1. Find the value of that corresponds to a confidence level of 91%.

A.

1.75

B.

1.34

C.

1.645

D.

1.70

1 points

Question 3

1. Find the appropriate critical value for the following:  99% confidence level ; n = 17; σ is unknown; population appears to be normally distributed.

A.

zα/2 = 2.567

B.

zα/2 = 2.583

C.

tα/2 = 2.898

D.

tα/2 = 2.921

2 points

Question 4

1. Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p. n = 195, x = 162; 95% confidence

A.

0.788 < p < 0.873

B.

0.777 < p < 0.884

C.

0.789 < p < 0.873

D.

0.778 < p < 0.883

1 points

Question 5

1. Thirty randomly selected students took the calculus final. If the sample mean was 95 and the standard deviation was 6.6, construct a 99% confidence interval for the mean score of all students.

A.

92.03 < μ < 97.97

B.

92.95 < μ < 97.05

C.

91.68 < μ < 98.32

D.

91.69 < μ < 98.31

1 points

Question 6

1. 50 people are selected randomly from a certain population and it is found that 12 people in the sample are over 6 feet tall. What is the point estimate of the proportion of people in the population who are over 6 feet tall?

A.

0.18

B.

0.76

C.

0.24

D.

0.50

2 points

Question 7

1. Use the given data to find the minimum sample size required to estimate the population proportion. Margin of error: 0.028; confidence level: 99%; and unknown

A.

2223

B.

2115

C.

1116

D.

1939