Stats Quiz 1

A school is having a contest in which students guess the number of candies in a jar. The student whose guess is closest to the correct number of candies in the jar wins a prize. The number of candies guessed by male and female students is shown in the back-to-back stemplot below. Which of the following statements is true about the center of guesses?

• A. The guesses for males range from 27 to 914, which is greater than the range of guess for females (64 to 122).

• B. The median guess for males is 124, which is greater than the median guess for females, which is 102.5.

• C. The median guess for males is 102.5, which is less than the median guess for females, which is 124.

• D. The median guess for males is 412, which is greater than the median guess for females, which is 102.5.

• E. The median guess for males is 102.5, which is less than the median guess for females, which is 412.

The histogram below shows the number of minutes needed by 45 minutes to finish playing a computer game. Which of the following statements is correct?

• A. The distribution is skewed to the right.

• B. The distribution is skewed to the left.

• C. The distribution appears to be normal.

• D. The distribution appears to be chi-square.

• E. The distribution appears to be uniform

As part of a study on the relationship between the use of tanning booths and the occurrence of skin cancer, researchers reviewed the medical records of 1,436 people. The table below summarizes tanning booth use for people in the study who did not and did not have skin cancer.

Of the people in the study who had skin cancer, what fraction used a tanning booth?

• 190/265

• 265/1436

• 190/896

• 846/1436

• 190/1436

Researchers conducted a telephone survey of 427 adults living in a large city. The adults were asked whether they planned to purchase a smart watch in the next year. The table shows the responses categorized by the region of the city in which the residents live.

Which of the following graphical displays is most appropriate for comparing the proportions of those surveyed who plan to purchase a smart watch within the four regions.

• a scatterplot

• a boxplot

• a back-to-back stemplot

• a segmented bar graph

• a dotplot

A random sample of 25 households from the La Joya ISD was surveyed. In this survey, data were collected on the age of the youngest child living in each household. The frequency distribution below displays the data collected in the survey. 

Which of the following is true regarding the shape of the distribution?

• A.    The distribution would be skewed to the right. 

• B.    The distribution would be approximately normal.

• C.     The distribution would be bimodal.

• D.    The distribution would be skewed to the left. 

• E.     The distribution would be uniform.