STAT 201 - Canvas Content Quizzes 1-4

The Chocolataboom Candy Company manufactures many types of different candies. Their most popular Valentine's Day box of candy follows a Normal Distribution with a mean of 486 grams and a standard deviation of 18.9 grams. You decide to buy a box of candy and weight it. Your box of candy weighs 462. Calculate the z-score for your box of candy. Round to 2 decimal points. (e.g. 12.34)

-1.27

What is the probability of a student being an honors student? (Answer should be in decimal format to three significant digits like 0.253) Born in TN (Y) and Honors (X) Count - No - Yes - Total No 334 15 349 Yes 524 50 574 Total 828 65 923

0.07

If the correlation coefficient is equal to 0.50, what is RSquare equal to? (2 decimal points)

0.25

What is the probability of a student being born in TN? (Answer should be in decimal format to three significant digits like 0.253) Born in TN (Y) and Honors (X) Count - No - Yes - Total No 334 15 349 Yes 524 50 574 Total 828 65 923

0.622

A test is given to students and the mean is 70 with a standard deviation of 3. Jerry scores a 74, find his z-score? NOTE- Report answer to two decimals.

1.33

The finishing times of a local 5k (3.1 mile) road race follows a normally distribution with a mean of 25 minutes and a standard deviation of 3 minutes, what percent of finishers do you expect to be above 31 minutes? (Use the empirical rule to solve the problem) Enter the value as a percent with one decimal point and no percent sign (e.g. 20.1)

2.5

The finishing times of a local 5k (3.1 mile) road race follows a normally distribution with a mean of 25 minutes and a standard deviation of 3 minutes, what percent of finishers do expect to be between 22 and 28 minutes? (Use the 68-95-99.7 Rule to solve the problem)

68

The median is highly influences by large outliers. a. True b. False

False

A ______________ is collected to make influences about a population. a. Statistics b. Variable c. Parameter d. Sample

Sample

If you know the RSquare value, to find the correlation coefficient, you would do which of the following: a. Take the square root of the RSquare value and check the direction of the scatterplot b. Square the RSquare value and check the direction of the scatterplor c. Multiple the RSquare value by 100 d. Take the square root of the RSquare value

Take the square root of the RSquare value and check the direction of the scatterplot

Quantitative variables must be numerical data. a. True b. False

True

When comparing histograms they should have the same horizontal axis. a. True b. False

True

A pareto chart is a special case of a _______________. a. pie chart b. histogram c. mosaic plot d. bar chart

bar chart

All data needs ____________ for us to understand it. a. variables b. statistics c. parameters d. context

context

The correlation coefficient (r) is not affected by outliers. a. true b. false

false

Which of the following is a univariate display of quantitative data? a. mosaic plot b. histogram c. scatterplot d. bar chart

histogram

To create a scatterplot, both variables must be a. categorical b. identifier c. quantitative

quantitative

Which of the following is a bivariate display of quantitative data? a. scatterplot b. mosaic plot c. bar chart d. histogram

scatterplot

How does a normal probability plot determine if a distribution is normal? a. the line is normal b. the line is straight c. the p-value is high d. the p-value is low

the line is straight

Adding together all the residuals from a regression plot will always sum to 0. a. true b. false

true

If the correlation coefficient (r) of two variables is close to 0, this implies there is no relationship between these two variables? a. true b. false

true

Outliers can make a weak correlation strong. a. true b. false

true

What type of variable best describes "Player ID" in a data set? a. No answer text provided b. Categorical c. Identifier d. Quantitative

Identifier