Question 1

Which of the following are true about Type II error?

Accepted Answer

The answer of Which of the following are true about...

Question 2

Which of the following should a reader of a research article be able to do, in order to decide whether the article's statistics are correctly selected and applied?

Accepted Answer

The answer of Which of the following should a reader...

Question 3

Why can Type I error and Type II error not be both present for one given hypothesis?

Accepted Answer

The answer of Why can Type I error and Type...

Question 4

A teacher administers an examination. The examination seemed relatively easy for the students, and the majority of the scores are at the high end of the scale, although several students received low scores. In statistical terms this represents what?

Accepted Answer

The answer of A teacher administers an examination. The examination...

Question 5

A researcher is attempting to decide whether to hire a statistician to assist with the statistical aspects of the study. If the researcher cannot perform all of the following for a quantitative study, why should a statistician be contacted?

Accepted Answer

The answer of A researcher is attempting to decide whether...

Question 6

A researcher is concerned about the power of a study. The researcher's planned interventional study examines the effect upon depression of instituting twice-yearly trips with the Road Scholar travel program for widows and widowers who have, 1 to 2 years before, lost a spouse to a long illness. What strategies could make Type II error less likely?

Accepted Answer

The answer of A researcher is concerned about the power...

Question 7

Findings can be statistically significant but clinically not significant. Which of the following studies with statistically significant findings exemplify this?

Accepted Answer

The answer of Findings can be statistically significant but clinically...

Question 8

A measured value is within two standard deviations of the mean but not within one standard deviation, and it is greater than the mean. The distribution is very close to a normal distribution. What does this signify?

Accepted Answer

The answer of A measured value is within two standard...

Question 9

Which of the following are true in a skewed distribution?

Accepted Answer

In a skewed distribution, the mean, mode, and median are not equal (A), the curve is asymmetrical (B), and more than 50% of the values lie to one side of the mean (E). A bimodal distribution (C) and having no mode (D) are not characteristics of skewness.

Question 10

Why might nonparametric statistical methods be used for analysis?

Accepted Answer

Nonparametric methods are used when data is nominal or ordinal (A) and when the sample size is small or does not meet the assumptions of normality (D).

Question 11

A data set shows that the mean, median, and mode are the same. This means which of the following?

Accepted Answer

The answer of A data set shows that the mean,...

Quiz 21: Introduction to Statistical Analysis