Analyzing Data

A researcher would like to determine if birth month is related to developing a blood clot. Which type of inferential statistic test should they perform?

Chi-squared

A researcher would like to determine how two variables in an experiment are related. Which type of inferential statistic test should they perform?

Regression analysis

Before analyzing data, it is important for all data to be expressed in the same units.

True

Inferential statistics tests use statistical hypotheses to identify differences between sets of data.

True

The standard error of the mean uses the standard deviation and sample size in its calculation.

true

The standard error of mean is considered a measure of central tendency.

false

The standard error or mean estimates the difference between the sample mean and population mean.

T

A cardiologist is trying to determine if a day of the week is related to incidence of heart attacks. When the researcher performs a chi-squared test, how many degrees of freedom should she use?

six

Inferential statistics are used to test for differences between two populations.

T2

mean

11

Median

10

Mode

13

Most scientific-based data analysis uses a significance value of 0.15.

F2

A researcher runs a t-test with 20 data points and gets a result of 3.52. According to the critical t-values table, what is the researcher’s result?

Reject H₀; there is a true difference between the two groups

Which variability measurement is calculated by subtracting the smallest value from the largest value?

Range

Chi-squared

Regression analysis

T-test

A researcher wants to determine the average value of a data set, but their data is skewed. Which measurement should they used?

Median

Remember

The standard deviation empirical rule determines the percentage of values under each part of the standard deviation curve. The rule states 99.72 percent of values will fall within three standard deviations from mean and 68.26 percent of values will fall within one standard deviations from the mean.

Select all of the following considered to be a measure of variability.

Range
Standard deviation
Variance

In a skewed data set, the mean should be used instead of the median.

False

The null hypothesis (H0) is used to state there is a difference between groups.

False

Select all of the following statistical tests which use degrees of freedom to interpret results.

Chi-squared, Regression analysis, T-test

How are expected values calculated in a chi-squared analysis?

Divide the total number of values by the number of possible outcomes