Find the percentage of observations that have z-scores above z = -2.75. Round your answer to the nearest tenth of a percent.

State the mean and standard deviation of the normal curve shown. What is the official name of this normal curve?

Multiple choice. From this box-plot, you can conclude that this data set is: a. Symmetric b. Skewed to the right c. Skewed to the left

A runner completed a race in 37.5 minutes. The average time for this race is 48 minutes, with a standard deviation of 6 minutes. What is the runner’s z-score?

Find the five-number summary with this set of data:     12,   13,   23,   25,   26,   26,  27, 30,  38,  39,  40

Find the percentage of scores which are less than 3.5. Round your answer to the nearest tenth of a percent.

What do statisticians use to measures both the strength and direction of a linear relationship. What letter is used to represent this measure?

The weights of bags of flour are normally distributed, with a mean of 5 pounds and a standard deviation of 0.2 pounds. How heavy must a bag be to be in the heaviest 90% of all bags? Round to the nearest tenth of a pound.

True or False? Histograms, stem-plots and line graphs display categorical data.

The ages of a group of graduate students are distributed in the following box plot. Give the 5 Number Summary for the data from the box-plot.

Determine the probable explanatory variable and response variable in the following relationship: The number of hours a Marine infantryman sleeps the night before a field exercise and how alert they feel during the exercise.

True or False? You ask several classmates how many credits they are taking. You have just collected quantitative data.

The line of best fit from the data in the table is: y = -0.404x + 8.821 and the correlation coefficient is r = -0.62. Use the regression equation to predict hours of sleep for a person who makes 9 social media posts. Are you extrapolating?