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QUESTION

# QUIZMAT540 Statistical Concepts for Research #1 Which of the following terms are included in a 95% confidence interval for the difference between two means found from a sample of 25 for each sample?T

QUIZ

MAT540 Statistical Concepts for Research

#1 Which of the following terms are included in a 95% confidence interval for the difference between two means found from a sample of 25 for each sample?

The mean

T value for a df of 48, at two tail .05

The standard error of the mean

All of these are used

Only a and b

#2 Confidence intervals are centered around a

Sample mean

Population mean

Either

Any desired sample statistic

#3 Practical significance of a statistical rejection of the null hypothesis is determined by

The p-value causing the rejection of the null hypothesis.

The size of the difference being measured.

An effect size calculation.

All rejections of the null hypothesis suggest a practical significance to the findings.

#4 The practical significance of a decision rejecting the null hypothesis should always be considered with every statistical test outcome.

True

False

#5 The effect size measure is an important way to assess the practical importance of a null hypothesis rejection decision.

True

False

#6 The effect size measure for a large chi square contingency table analysis is

Eta squared

Cohen’s D

Cramer’s V

All of these are appropriate

#7 The confidence level in a confidence interval is established by

A Z-value, such as 1.96 for a 95% confidence interval

A t-value, using the appropriate degrees of freedom and the level desired

The appropriate statistic for the test distribution

The F statistic, using the appropriate degrees of freedom and the level desired

#8 Confidence intervals are used in decision making, when a range of possible outcomes is preferred.

True

False

#9 The effect size measure for the t-test is

Eta squared

Cohen’s D

|r|

All of these are appropriate

#10 Which of the following terms are included in a 95% confidence interval for a mean found from a sample of 25?

The mean

T value for a df of 24, at two tail .05

The standard error of the mean

All of these are used

Only a and b

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