Unit 5 Review - Statistics & Measure of Center - Practice

What is the size of the sample?

• 36

• 39

• 60

• 21

If the convenience store manager expects to sell 540 pieces of candy next week, which is the best prediction of how many Reese’s they should have in the store?

• 108

• 135

• 81

• 216

Which of the following box-and-whisker           plots has a range of 36?

• Data set A

• Data set B

• Data set C

 The box-and-whisker plot shows the profits for two different companies (in millions of dollars).  Find the median profit for both companies.

• 18.5, 18

• 5.5, 5

• 15, 12

• 27, 24

Which of the following statements is true?

• The median age of women is greater than men.

• The median age of both women and men are the same.

• The lower quartile for the ages of men is greater than the upper quartile for the ages of women.

•  The range of women's ages is greater than the range of means’ ages.

Compare the interquartile ranges (IQR) of the two box-and-whisker plots. Choose the statement that best describes the relationship.

• The IQRs are the same for both women and men ages.

•  The IQR for men is greater than the IQR for women.

• The IQR for women is greater than the IQR for men.

•   The IQR for both categories cannot be determined.

A librarian chooses 100 books from the library’s database using every third book in the data base to calculate the average length of a library book.

Would this be an example of a random sample or a biased sample?

• random sample

• biased sample

The first 50 people exiting a movie are surveyed to find out what type of movie the people in town like to see.

Would this survey make a random sample or a biased sample?

• random sample

• biased sample

Trey and Jason are training to run a marathon.  They have been running for 9 days and        recorded how many miles they each ran.  Their results are listed below as Sample A:  Trey        and Sample B:  Jason.

• Sample A, Trey Mean = 4.78 miles

  Sample B, Jason Mean = 7.33 miles

• Sample A, Trey Mean = 4.00 miles

  Sample B, Jason Mean = 7.00 miles

• Sample A, Trey Mean = 6 miles

  Sample B, Jason Mean = 8 miles

• Sample A, Trey Mean = 4.42 miles

  Sample B, Jason Mean = 7.22 miles

The Stem and Leaf Ploth in the picture is visually __________.

• Skewed Right

• Symmetric

• Skewed Left

• Unable to Determine