Question

The random numbers generated using Excel's RAND function follows a __________ probability distribution between 0 and 1.

a. uniform

b. normal

c. binomial

d. random

The CEO of a company wants to estimate the percent of employees that use company computers to go on Facebook during work hours with 95% confidence. He selects a random sample of 150 of the employees and finds that 53 of them logged onto Facebook that day. What is the estimate of the standard error of the proportion σp̄?

a. 0.350

b. 0.039

c. 0.455

d. 0.050

A simple random sample of 31 observations was taken from a large population. The sample mean equals 5. Five is a

a. population mean.

b. standard error.

c. point estimate.

d. population parameter

Answer 1

Q.1) The random numbers generated using Excel's RAND function follows a Uniform probability distribution between 0 and 1.

Answer : a) Uniform

Q.2) Given that, n = 150 and x = 53

=> sample proportion = 53/150 = 0.3533

The estimate of the standard error of the proportion is,

Answer : b) 0.039

Q.3) Given that, sample size (n) = 31 and sample mean = 5

Here, point estimate for the population mean is a sample mean which is equal to 5.

Therefore, Five is a point estimate.

Answer : c) point estimate

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