FBA UIOWA

Let α be the level of significance. Reject the null hypothesis if:

p-value is less than or equal to alpha

A survey of adults in several countries was conducted to determine the percentage of adults who use social networking sites. Consider the following countries in this study: Germany, France, Belgium, and Ireland. Using a 0.05 level of significance, conduct a hypothesis test to determine whether the proportion of adults using social networking sites is equal for all four countries. Determine the type of statistical test to be used?

Chi-Square Test

A poll surveyed people in various countries to assess attitudes toward a variety of alternate forms of energy. Using a 0.05 level of significance, conduct a hypothesis test to determine whether people's attitude toward building new nuclear power plants is independent of country. Determine the type of statistical test to be used.

Ch-Square Test

A histogram is NOT appropriate for displaying which of the following types of information?

Cumulative Frequency

If several frequency distributions are constructed from the same data set, the distribution with the widest class width will have the _____.

Fewest Classes

The second quartile is always equal to the _______.

Median

In a cumulative frequency distribution, the last class will always have a cumulative frequency equal to _____.

The total number of elements in the data set

If the covariance between two variables x and y is negative, then:

There is a negative relationship between x and y

If the correlation coefficient between two variables x and y is 0, then:

There is not a linear relationship between x and y

TRUE or FALSE: The correlation coefficient between two variables x and y is not affected by the units of measurement of x and y. Correct!

True

A company conducted two separate surveys to determine customer satisfaction with its products. Customers reported scores from 0-100 with 100 indicating extreme satisfaction. Using a 0.05 level of significance, conduct a hypothesis test to determine whether the average customer satisfaction differs between Product A and Product B. Determine the type of statistical test to be used?

t-Test

The U.S. Department of Transportation provides the number of miles that residents of the 75 largest metropolitan areas travel per day in a car. We will consider random samples of Buffalo residents and Boston residents. The population standard deviation of Buffalo residents' miles traveled is known to be 8 miles per day. The population standard deviation of Boston residents' miles traveled is known to be 7 miles per day. Using a 0.05 level of significance, conduct a hypothesis test to determine whether the average miles traveled by Buffalo residents and Boston residents differ. Determine the type of statistical test to be used?

z-Test

A _____ determines how far a particular value is from the mean relative to the data set's standard deviation.

z-score