What is the critical t-value for a 98 percent confidence interval with 18 degrees of freedom?

Correct answer: 2.552

Explanation

This question requires calculating the correct tail-area from a confidence level and then finding the corresponding critical value in the Student's t-distribution table.

Other questions

Question 1

According to Table A1 F critical values, what is the critical value F* for p=0.100 with 1 degree of freedom in the numerator and 2 degrees of freedom in the denominator?

Question 2

Using the Standard Normal Probability Distribution Z Table (Table A12), what is the area under the curve between z = 0 and z = 1.54?

Question 3

According to Table A13 'Probability of Exceeding the Critical Value' for the Student's t Distribution, what is the critical value for a one-tailed test with a=0.01 and 15 degrees of freedom?

Question 4

What is the critical value from the Chi-Square Probability Distribution table (Table A14) for an area to the right of 0.950 with 10 degrees of freedom?

Question 5

The F distribution table has two different sets of degrees of freedom. According to Table A1 on page 589, what do these two degrees of freedom represent?

Question 6

In the Standard Normal Z Table (Table A12), what does the numerical entry in the table represent?

Question 7

What is the critical F-value from Table A2 for p=0.010, 20 degrees of freedom in the numerator, and 3 degrees of freedom in the denominator?

Question 8

For the Student's t Distribution (Table A13), what happens to the critical t-value as the degrees of freedom (v) approach infinity?

Question 9

Using Table A14 for the Chi-Square distribution, find the critical value for a test with 20 degrees of freedom and a significance level of 0.01 for a right-tailed test.

Question 10

According to the Z Table (Table A12), what is the z-score that corresponds to an area of 0.4750 between the mean and the z-score?

Question 11

Find the critical value from the F distribution table (Table A5) for p=0.050, with 12 degrees of freedom in the numerator and 8 degrees of freedom in the denominator.

Question 12

For a Student's t distribution with 29 degrees of freedom, what is the critical value t such that the probability of exceeding it is 0.005?

Question 13

Find the probability P(Z > 2.05) using the Standard Normal Z Table.

Question 14

What is the critical value for a Chi-Square distribution with df = 30 and an area of 0.990 to its right?

Question 15

Using Table A8, what is the F critical value for a test with p=0.010, 8 degrees of freedom in the numerator, and 19 degrees of freedom in the denominator?

Question 16

Find the z-score from Table A12 that has 40 percent of the distribution's area between 0 and z.

Question 17

What is the critical value for a two-tailed Student's t-test with a significance level of 1 percent and 25 degrees of freedom?

Question 18

Using the Chi-Square table (Table A14), find the value that has 0.025 of the area to its right for a distribution with 13 degrees of freedom.

Question 19

Find the critical F-value from Table A10 for p=0.050, 60 degrees of freedom in the numerator, and 50 degrees of freedom in the denominator.

Question 20

What is the area under the standard normal curve to the left of z = -1.05?

Question 22

For a Chi-Square distribution with 8 degrees of freedom, 99.5 percent of the area is to the right of what critical value?

Question 23

Find the critical F-value from Table A9 for p=0.001, with 20 degrees of freedom in the numerator and 24 degrees of freedom in the denominator.

Question 24

What is the probability P(-0.55 < Z < 1.10) according to the Standard Normal Z Table?

Question 25

For the Student's t distribution, the value 1.711 is the critical value for which degrees of freedom and alpha level for a one-tailed test?

Question 26

Using the F distribution table A7, what is the critical value for p=0.025 with 60 degrees of freedom in the numerator and 16 in the denominator?

Question 27

What is the probability P(Z < 2.50) using the Standard Normal Z Table?

Question 28

In the Chi-Square distribution table (Table A14), what is the critical value for df = 40 and an area to the right of 0.050?

Question 29

For a Student's t-test, if the degrees of freedom are 60 and the significance level for a one-tailed test is 0.05, what is the critical value?

Question 30

What is the critical F-value for a significance level of 0.05, with df1=5 and df2=9?

Question 31

Using the Z-table, what percentage of the data in a standard normal distribution falls between z = -1.5 and z = 1.5?

Question 32

What is the critical value t for a one-tailed test with a significance level of 0.10 and 12 degrees of freedom?

Question 33

Find the critical value from the Chi-Square table (Table A14) that cuts off the top 1 percent of the distribution for df = 15.

Question 34

Using Table A1, find the critical F-value for p = 0.025 with df1 = 3 and df2 = 7.

Question 35

What is the area to the right of z=3.00 on a standard normal distribution curve?

Question 36

For a t-distribution with 1000 degrees of freedom, the critical value for a=0.025 is 1.96. What distribution does the t-distribution approximate at very large degrees of freedom?

Question 37

Using Table A14, determine the Chi-Square value for which 90 percent of the area lies to its right, given 11 degrees of freedom.

Question 38

What is the critical F-value for a test with a significance level of 0.001, df1=6, and df2=5?

Question 39

Find the area under the standard normal curve between z = 0.50 and z = 1.50.

Question 40

The Figure A3 heading for the Student's t Distribution table shows the values tv,a. What does 'a' represent in this notation?

Question 41

What is the critical value for a Chi-Square distribution with df=90 and a right-tail area of 0.100?

Question 42

Using Table A6, find the F critical value for p=0.001 with 10 degrees of freedom in the numerator and 28 degrees of freedom in the denominator.

Question 43

Find the z-score that corresponds to the 80th percentile of the standard normal distribution.

Question 44

What is the critical value from the Student's t distribution for df=40 and a=0.025?

Question 45

Find the critical value for a Chi-Square distribution that separates the lower 5 percent of the area from the rest of the distribution, given df=18.

Question 46

Using Table A11, find the critical F-value for p=0.100 with 1000 degrees of freedom in the numerator and 60 in the denominator.

Question 47

What is the probability P(-2.15 < Z < -1.15) according to the Standard Normal Z Table?

Question 48

For a Student's t-distribution with df=1, what is the critical value for a=0.001?

Question 49

Find the Chi-Square value that has 2.5 percent of the area to its left for a distribution with 22 degrees of freedom.

Question 50

Using the F distribution table A1, what is the critical value for p = 0.001, with 9 degrees of freedom in the numerator and 1 degree of freedom in the denominator?