A researcher would like to know if amount of sleep affects memory. He invited 150 volunteers for night in his lab and randomly assigned half of the participants to one of two experimental conditions (i.e., Normal Sleep or Reduced Sleep). On the following morning, all participants took the same memory test. What statistical test should be used in order to find out if there is a significant difference in memory performance between the two sleep groups?

Group of answer choices

Person correlation.

T-test for dependent samples.

T-test for independent samples.

Chi² for Independence.

Chi2 for Goodness of Fit.

One-factor Anova for independent samples..

A sample of children was tested on vocabulary knowledge at the age of 10 and then again, at the age of 12. What statistical test should be used in order to find out if there is a significant improvement in vocabulary between the age of 10 and 12?

Group of answer choices

Chi² for Goodness of Fit.

Pearson correlation.

T- test for independent samples.

T-test for dependent samples.

One-factor Anova for independent samples.

Chi² for Independence.

A marketing researcher would like to examine preferences for six new candies using a sample of n = 300 individuals. Each individual will be asked to taste all six candies and select his/her favorite. What statistical test should be used for statistical analysis in this study (i.e., to examine if there is any difference in preferences for new candies)?

Group of answer choices

one-factor ANOVA for independent samples.

t-test for independent samples.

Chi² test for Independence

Chi² test for Goodness of Fit

Pearson correlation

A researcher records ethnicity of each child enrolled in the after school tutoring program. This researcher is measuring a(n) __________ variable.

Group of answer choices

nominal

ordinal

interval

ratio

If an instructor tells you that your score on the final exam corresponds to a z = 0.5 than _____.

Group of answer choices

your got a very high score on the final.

your got an average score on the final.

your got a low score on the final.

None of the above.

An average variability of sample means in a distribution of sample means is called _______.

Group of answer choices

standard deviation.

standard error (or estimated standard error).

estimated variance.

mean sum of squares.

A researcher wants to examine the effectiveness of three types of classroom instruction. She designed three types of instruction for three different samples of students. Afterwards, all participants were given the same performance test and the test averages were compared. What statistical test should be used by the researcher to analyze the outcomes of this study?

Group of answer choices

T-test for dependent samples.

One-factor ANOVA for independent samples.

T-test for independent samples.

Pearson Correlation.

Chi² for Goodness of Fit.

Chi² for Independence.

In hypothesis testing, the null hypothesis ___________.

Group of answer choices

concerns a population from which a sample(s) was/were selected

is denoted by the symbol H₀

generally states that there is no effect, no change, or no difference

all of the above