A sample of five price/earnings ratios for companies in the Services sector follows: 37 11 14 17 12 Estimate the population mean p/e ratio for the Services sector.
10.76
14
18
18.2
None of the above answers is correct
A sample of five price/earnings ratios for companies in the Services sector follows: 37 11 14 17 12 Estimate the population standard deviation of the p/e ratios for the Services sector.
9.62
10.76
11.5
115.7
None of the above answers is corrct
A tire manufacturer would like to know what percentage of their company-owned store's customers' tires are underfilled. Over the next few months 100 vehicles are randomly chosen and a tire's pressure is recorded. Of the 100 tires chosen, 60 are underfilled. Estimate the population proportion of underfilled tires.
0.06
0.4
0.6
60 tires
None of the above answers is correct
If samples of size 45 are chosen from a uniform distribution and the sample mean recorded, the sample means will take on the shape of which distribution?
Exponential
Normal
Uniform
Not enough information is given to answer this question
A population has a mean of 75 and a standard deviation of 10. Samples of size 20 are chosen and the sample means recorded. What is the expected value of the sample mean?
2.236
10
75
Not enough information is given to answer this question
A population has a mean of 75 and a standard deviation of 10. Samples of size 20 are chosen and the sample means recorded. What is the standard deviation of the sample means?
2.236
10
75
Not enough information is given to answer this question
A population has a mean of 75 and a standard deviation of 10. Samples of size 20 are chosen and the sample means recorded. What is the shape of the sample means?
Exponential
Normal
Uniform
Not enough information is given to answer this question
Samples of size 81 are taken from a population of size 500 with mean 10 and standard deviation 3. Find the standard deviation of the sample means.
0.3054
0.3333
0.9163
3
None of the above
As population size increases, the value of the finite population standard deviation of the sample mean
decreases
gets closer to the infinite standard deviation of the sample mean.
both a and b
None of the above
The admissions office at a college reported that this year's freshman class had an average SAT score of 1103 with a standard deviation of 95. What is the probability that a sample of 40 students from this year's freshman class had an average score greater than 1120?
0.1292
0.3708
0.6292
0.8708
None of the above
The admissions office at a college reported that this year's freshman class had an average SAT score of 1103 with a standard deviation of 95. What is the probability that a sample of 40 students from this year's freshman class had an average score greater than 1100?
0.0793
0.4207
0.5793
0.9207
None of the above
40% of the employees at a large corporation are female. A sample of 50 employees is taken and gender is recorded. What is the probability of a sample proportion of females in the sample between .35 and .45?
0.0693
0.2642
0.5284
0.72
None of the above
40% of the employees at a large corporation are female. A sample of 50 employees is taken and gender is recorded. What is the probability of a sample proportion of females in the sample between .35 and .45?
0.0693
0.2642
0.5284
0.72
None of the above
If the expected value of a point estimator is equal to the population parameter, then the point estimator is known as consistent.
True
False
. A sampling method in which one of the first k elements is selected and then every kth element thereafter is selected is known as