STAT 4TH PT REVIEWER

What is the statistical method used in making decisions using experimental data?

• observation

• simple analysis

• analytical testing

• hypothesis testing

What term is being used to describe a proposed explanation, assertion, or assumption about a population parameter or about the distribution of a random variable?

• statistic

• decision

• hypothesis

• probability

If the variance is unknown and the sample size is small, which test statistic is appropriate?

• t-test

• z-test

• two-tailed test

• one-tailed test

Based on the Central Limit Theorem, when the sample (n) is extremely large and the variance is known, what is the statistical test to be used?

• t-test

• z-test

• two-tailed test

• one-tailed test

When the population variance is assumed to be known, what is the appropriate form of the test statistic?

• z-test.

• t-test.

• Chi-square test.

• F-test.

What is the appropriate form of the test statistic when comparing two population proportions?

• z-test.

• t-test.

• Chi-square test.

• F-test.

Under the normal curve, what do you call the values that separate the rejection region from the acceptance region?

• Confidence coefficients

• z-values

• computed statistics

• critical values

What is a graph of ordered pairs showing a relationship between two sets of data?

• bivariate

• dependent variable

• scatter plot

• univariate data

When the values of two variables move in the same direction, what kind of correlation it is?

• Linear

• Non-linear

• Positive

• Negative

If all the points of a scatter diagram lie on a straight line falling from left upper corner to the right bottom corner, what kind of the correlation is illustrated?

• Zero correlation

• Perfect negative correlation

• High degree of positive correlation

• Perfect positive correlation