Question 1

The fourth step in conducting the single-sample t test is:

Accepted Answer

A)  identifying a Type I error. 
B)  determining the critical values or cutoffs. 
C)  calculating the test statistic. 
D)  determining the characteristics of the comparison distribution. 
A)  identifying a Type I error. 
B)  determining the critical values or cutoffs. 
C)  calculating the test statistic. 
D)  determining the characteristics of the comparison distribution. B

Question 2

A single-sample t test is conducted on a sample of 26 people who were selected from a large population estimated at 2500 people.The critical cutoff for a two-tailed test at a p level of 0.05 would be:

Accepted Answer

A)  -1.706 and 1.706. 
B)  -1.708 and 1.708. 
C)  -2.056 and 2.056. 
D)  -2.060 and 2.060. 
A)  -1.706 and 1.706. 
B)  -1.708 and 1.708. 
C)  -2.056 and 2.056. 
D)  -2.060 and 2.060. D

Question 3

For smaller samples, the t distributions are skinnier and taller than the z distributions.

Accepted Answer

A) True 
 B)False  False

Question 4

The appropriate APA format for the presentation of t test results appears as: t(19) = 3.13, p < 0.05.

Accepted Answer

A) True 
 B)False

Question 5

The t statistic indicates the distance of a sample mean from a population mean in terms of estimated standard error.

Accepted Answer

A) True 
 B)False

Question 6

There is one t distribution for each possible sample size.

Accepted Answer

A) True 
 B)False

Question 7

In order to conduct a single-sample t test, one needs to know:

Accepted Answer

A)  the population mean and standard deviation, and the standard error of the sample. 
B)  all properties of the sample and the population. 
C)  the mean of the sample and all properties of the population. 
D)  the population mean and the properties of the sample. 
A)  the population mean and standard deviation, and the standard error of the sample. 
B)  all properties of the sample and the population. 
C)  the mean of the sample and all properties of the population. 
D)  the population mean and the properties of the sample.

Question 8

To calculate df, subtract ____ from ____.

Accepted Answer

A)  2; N 
B)  2; n 
C)  1; N 
D)  1; n 
A)  2; N 
B)  2; n 
C)  1; N 
D)  1; n

Question 9

For smaller samples, the t distributions are wider and flatter than the z distributions.

Accepted Answer

A) True 
 B)False

Question 10

A newspaper article reported that the typical American family spent an average of $81 for Halloween candy and costumes last year.A sample of N = 16 families this year reported spending a mean of M = $85, with s = $20.What statistical test would be used to determine whether these data indicate a significant change in holiday spending?

Accepted Answer

A)  single-sample t test 
B)  z test 
C)  effect size test 
D)  paired-samples t test 
A)  single-sample t test 
B)  z test 
C)  effect size test 
D)  paired-samples t test

Question 11

A negatively skewed distribution would most likely violate which assumption?

Accepted Answer

A)  normality 
B)  dependent variable is scale 
C)  random selection 
D)  random assignment 
A)  normality 
B)  dependent variable is scale 
C)  random selection 
D)  random assignment

Question 12

A researcher collects 25 data points that yield a mean of 8.164 and a standard deviation (based on N - 1) of 2.237.If the researcher is comparing the sample to a population mean of 9.2 using a single-sample t test, what would be the effect size?

Accepted Answer

A)  -0.60 
B)  -0.46 
C)  0.46 
D)  0.68 
A)  -0.60 
B)  -0.46 
C)  0.46 
D)  0.68

Question 13

The appropriate APA format for the presentation of t test results appears as: t = 3.13, df = 19, p < 0.05.

Accepted Answer

A) True 
 B)False

Question 14

For a two-tailed t test, there are two critical cutoff values.

Accepted Answer

A) True 
 B)False

Question 15

When performing a single-sample t test, an effect size of 0.20 would be interpreted as a _____ effect.

Accepted Answer

A)  small 
B)  medium 
C)  large 
D)  negligible 
A)  small 
B)  medium 
C)  large 
D)  negligible

Question 16

A t distribution with 2 degrees of freedom has fewer extreme scores than a t distribution with 30 degrees of freedom.

Accepted Answer

A) True 
 B)False

Question 17

The correct formula for the lower bound of a confidence interval for a single-sample t test is:

Accepted Answer

A)  t(sM) + Msample. 
B)  -t(sM) - Msample. 
C)  t(sM) - Msample. 
D)  -t(sM) +Msample. 
A)  t(sM) + Msample. 
B)  -t(sM) - Msample. 
C)  t(sM) - Msample. 
D)  -t(sM) +Msample.

Question 18

The correct formula for Cohen's d for a single-sample t test is:

Accepted Answer

A)  (X - M)/N. 
B)  (X - M)/(N - 1). 
C)  (M - $\mu  $)/s. 
D)  (M - $\mu  $)/(s - 1). 
A)  (X - M)/N. 
B)  (X - M)/(N - 1). 
C)  (M - $\mu  $)/s. 
D)  (M - $\mu  $)/(s - 1).

Question 19

For the single-sample t test, the confidence interval is centered around the:

Accepted Answer

A)  sample mean. 
B)  population mean. 
C)  difference between the sample and population means. 
D)  standard error of the distribution of means. 
A)  sample mean. 
B)  population mean. 
C)  difference between the sample and population means. 
D)  standard error of the distribution of means.

Question 20

H1: $\mu  $1 $\neq$ $\mu  $2 is used to represent the:

Accepted Answer

A)  confidence interval. 
B)  research hypothesis. 
C)  null hypothesis. 
D)  standard error. 
A)  confidence interval. 
B)  research hypothesis. 
C)  null hypothesis. 
D)  standard error.

The fourth step in conducting the single-sample t test is:

A single-sample t test is conducted on a sample of 26 people who were selected from a large population estimated at 2500 people.The critical cutoff for a two-tailed test at a p level of 0.05 would be:

For smaller samples, the t distributions are skinnier and taller than the z distributions.

The appropriate APA format for the presentation of t test results appears as: t(19) = 3.13, p < 0.05.

The t statistic indicates the distance of a sample mean from a population mean in terms of estimated standard error.

There is one t distribution for each possible sample size.

In order to conduct a single-sample t test, one needs to know:

To calculate df, subtract from .

For smaller samples, the t distributions are wider and flatter than the z distributions.

A negatively skewed distribution would most likely violate which assumption?

A researcher collects 25 data points that yield a mean of 8.164 and a standard deviation (based on N - 1) of 2.237.If the researcher is comparing the sample to a population mean of 9.2 using a single-sample t test, what would be the effect size?

The appropriate APA format for the presentation of t test results appears as: t = 3.13, df = 19, p < 0.05.

For a two-tailed t test, there are two critical cutoff values.

When performing a single-sample t test, an effect size of 0.20 would be interpreted as a _____ effect.

A t distribution with 2 degrees of freedom has fewer extreme scores than a t distribution with 30 degrees of freedom.

The correct formula for the lower bound of a confidence interval for a single-sample t test is:

The correct formula for Cohen's d for a single-sample t test is:

For the single-sample t test, the confidence interval is centered around the:

H₁: $\mu$ ₁ $\neq$ $\mu$ ₂ is used to represent the:

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Central Tendency and Variability

Sampling and Probability

The Normal Curve, Standardization and Z Scores

Hypothesis Testing With Z Tests

Confidence Intervals, Effect Size, and Statistical Power

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

Exam 9: The Single-Sample T Test

The fourth step in conducting the single-sample t test is:

A single-sample t test is conducted on a sample of 26 people who were selected from a large population estimated at 2500 people.The critical cutoff for a two-tailed test at a p level of 0.05 would be:

For smaller samples, the t distributions are skinnier and taller than the z distributions.

The appropriate APA format for the presentation of t test results appears as: t(19) = 3.13, p < 0.05.

The t statistic indicates the distance of a sample mean from a population mean in terms of estimated standard error.

There is one t distribution for each possible sample size.

In order to conduct a single-sample t test, one needs to know:

To calculate df, subtract ____ from ____.

For smaller samples, the t distributions are wider and flatter than the z distributions.

A negatively skewed distribution would most likely violate which assumption?

A researcher collects 25 data points that yield a mean of 8.164 and a standard deviation (based on N - 1) of 2.237.If the researcher is comparing the sample to a population mean of 9.2 using a single-sample t test, what would be the effect size?

The appropriate APA format for the presentation of t test results appears as: t = 3.13, df = 19, p < 0.05.

For a two-tailed t test, there are two critical cutoff values.

When performing a single-sample t test, an effect size of 0.20 would be interpreted as a _____ effect.

A t distribution with 2 degrees of freedom has fewer extreme scores than a t distribution with 30 degrees of freedom.

The correct formula for the lower bound of a confidence interval for a single-sample t test is:

The correct formula for Cohen's d for a single-sample t test is:

For the single-sample t test, the confidence interval is centered around the:

H1: μ\mu μ 1 ≠\neq= μ\mu μ 2 is used to represent the:

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Central Tendency and Variability

Sampling and Probability

The Normal Curve, Standardization and Z Scores

Hypothesis Testing With Z Tests

Confidence Intervals, Effect Size, and Statistical Power

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

To calculate df, subtract from .

H₁: $\mu$ ₁ $\neq$ $\mu$ ₂ is used to represent the: