Question 1

The denominator in the formula for the t-statistic is __________.

Accepted Answer

A)  sM 
B)  σM 
C)  σ 
D)  $\sqrt{\pi}$ 
A)  sM 
B)  σM 
C)  σ 
D)  $\sqrt{\pi}$

Question 2

The t-distribution is a ______________ distribution whose shape changes according to the ________________.

Accepted Answer

A)  theoretical; size of the sample 
B)  empirical; size of the sample 
C)  theoretical; standard deviation 
D)  empirical; standard deviation 
A)  theoretical; size of the sample 
B)  empirical; size of the sample 
C)  theoretical; standard deviation 
D)  empirical; standard deviation

Question 3

If the results of a t test include the statement that "p < .05," then

Accepted Answer

A)  you will fail to reject H₀. 
B)  your obtained t-value has a high probability of occurrence. 
C)  you have gained support for H₁. 
D)  the result is not significant. 
A)  you will fail to reject H₀. 
B)  your obtained t-value has a high probability of occurrence. 
C)  you have gained support for H₁. 
D)  the result is not significant.

Question 4

The t-distribution is used if

Accepted Answer

A)  samples are larger than 60. 
B)  the population mean is not known. 
C)  the population standard deviation is known. 
D)  the population standard deviation is unknown. 
A)  samples are larger than 60. 
B)  the population mean is not known. 
C)  the population standard deviation is known. 
D)  the population standard deviation is unknown.

Question 5

If df is 20 for a one-sample t test, what is the sample size?

Accepted Answer

A)  19 
B)  18 
C)  22 
D)  21 
A)  19 
B)  18 
C)  22 
D)  21

Question 6

When using the t-statistic,

Accepted Answer

A)  the value of σ is known. 
B)  the value of σ is unknown. 
C)  we can directly calculate a value for σ. 
D)  a standard deviation is not needed. 
A)  the value of σ is known. 
B)  the value of σ is unknown. 
C)  we can directly calculate a value for σ. 
D)  a standard deviation is not needed.

Question 7

The national average on the ACT math test is 20.5. A sample of n = 9 incoming college freshmen is tested at a local university. The mean of the sample is M = 22.7 with a s = 4. Does the sample mean differ significantly from the national average? Test at α = .05.

Accepted Answer

Step 1:
H₀: μ = 20.5
H₁: μ ≠ 20.5
Step 2

Question 8

The number in parentheses ( ) just before the reported t-value in the results section (step four) of a hypothesis test is

Accepted Answer

A)  n 
B)  df 
C)  α 
D)  tcrit 
A)  n 
B)  df 
C)  α 
D)  tcrit

Question 9

Given M = 26, n = 9, μ = 23, and s = 6.2, Cohens's d is _______, which is considered to be a ______________ effect.

Accepted Answer

A)  .48; small 
B)  .48; moderate 
C)  1.44; large 
D)  1.44; extra large 
A)  .48; small 
B)  .48; moderate 
C)  1.44; large 
D)  1.44; extra large

Question 10

A one-sample t test is conducted which resulted in a significant effect. The sample mean was 42 based on a sample size of n = 16. The population mean was 50 with s = 2.33. What was Cohen's d effect size?

Accepted Answer

A)  3.43 
B)  .86 
C)  .13 
D)  2 
A)  3.43 
B)  .86 
C)  .13 
D)  2

The denominator in the formula for the t-statistic is __________.

The t-distribution is a distribution whose shape changes according to the __.

If the results of a t test include the statement that "p < .05," then

The t-distribution is used if

If df is 20 for a one-sample t test, what is the sample size?

When using the t-statistic,

The national average on the ACT math test is 20.5. A sample of n = 9 incoming college freshmen is tested at a local university. The mean of the sample is M = 22.7 with a s = 4. Does the sample mean differ significantly from the national average? Test at α = .05.

The number in parentheses ( ) just before the reported t-value in the results section (step four) of a hypothesis test is

Given M = 26, n = 9, μ = 23, and s = 6.2, Cohens's d is _, which is considered to be a ________ effect.

A one-sample t test is conducted which resulted in a significant effect. The sample mean was 42 based on a sample size of n = 16. The population mean was 50 with s = 2.33. What was Cohen's d effect size?

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Measures of Variability

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

Two-Sample T-Test: Independent Samples Design

Two-Sample T-Test: Related Samples Design

Confidence Interval Versus Point Estimation

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

Exam 9: One-Sample T-Test

The denominator in the formula for the t-statistic is __________.

The t-distribution is a ______________ distribution whose shape changes according to the ________________.

If the results of a t test include the statement that "p < .05," then

The t-distribution is used if

If df is 20 for a one-sample t test, what is the sample size?

When using the t-statistic,

The national average on the ACT math test is 20.5. A sample of n = 9 incoming college freshmen is tested at a local university. The mean of the sample is M = 22.7 with a s = 4. Does the sample mean differ significantly from the national average? Test at α = .05.

The number in parentheses ( ) just before the reported t-value in the results section (step four) of a hypothesis test is

Given M = 26, n = 9, μ = 23, and s = 6.2, Cohens's d is _______, which is considered to be a ______________ effect.

A one-sample t test is conducted which resulted in a significant effect. The sample mean was 42 based on a sample size of n = 16. The population mean was 50 with s = 2.33. What was Cohen's d effect size?

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Measures of Variability

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

Two-Sample T-Test: Independent Samples Design

Two-Sample T-Test: Related Samples Design

Confidence Interval Versus Point Estimation

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

The t-distribution is a distribution whose shape changes according to the __.

Given M = 26, n = 9, μ = 23, and s = 6.2, Cohens's d is _, which is considered to be a ________ effect.