Exam 3: Numerical Summaries of Data

A study found that the mean amount of time that people in the United States spent watching TV was 108.1 hours per year. The same study found that the median was 109.2 hours per year. If a histogram Were constructed for the data, would you expect it to be skewed to the right, to the left, or Approximately symmetric?

The following population parameters were obtained from a graphing calculator. Assuming the population is bell-shaped, approximately what percentage of the population values are between 51 and 91?

Construct a boxplot for the data set below. 32 29 19 5 8 19 35 7 13 17 17 11 17 17 5 8 14 14 14 10

The mean systolic blood pressure for a sample of 500 individuals is 110 with a standard deviation of 16. A patient's systolic blood pressure is measured at 84. What is the z-score for this measurement?

Elizabeth worked at three part-time jobs last week. At one job, she worked 5 hours at a salary of $12 per hour, at the second she worked 15 hours at $10 per hour, and at the third she worked 20 Hours at $15 per hour. What was her mean hourly wage?

A data set has a mean of 50 and a standard deviation of 10. Which of the following might possibly be true?

The following table presents the number of monthly users for the 7 most popular mobile apps. Application Monthly Users (millions) Facebook 121.1 YouTube 97.2 Facebook Messenger 95.5 Google Search 81.6 Google Play 77.0 Google Maps 75.5 Pandora Radio 73.9 Find the mean number of monthly users.

For the data set below, find the IQR. 167 171 175 183 188 188 193 200 209 250

Find the sample standard deviation for the following data set: 22 13 34 27 18

For the data set below, find the 37th percentile. 64 95 74 70 32 58 24 46 25 17 59 51 7 60 36 67 67 54 33 60

Find the mean of the data in the following stem-and-leaf plot. The leaf represents the ones digit. 1 7 2 122489 3 8 4 23

Find the population standard deviation for the following data set: 36 16 31 17 24

Find the mean for the following data set: 16 10 22 23 10

Find the sample variance for the following data set: 23 14 32 29 17

The following data represent the total price, in dollars, of 20 randomly-selected gasoline purchases at a certain convenience store. 53.00 64.69 46.33 72.14 56.86 67.91 47.89 66.10 61.80 44.33 61.49 45.76 80.00 79.06 41.75 59.91 49.06 52.85 46.98 10.42 Which value in this data set is most accurately described as an extreme value?

Following are the closing prices (in dollars) of a certain stock for the past 20 trading days. 149.54 131.62 132.99 144.42 132.58 133.24 135.52 139.78 152.12 134.13 126.81 131.94 133.29 142.06 156.96 139.56 125.11 158.80 129.80 144.99 Find the population standard deviation for the closing prices.

For the data set below, find the outlier(s). 210 172 252 183 183 179 191 197 169 202

For the data set below, find the upper outlier boundary. 166 174 175 183 188 190 197 204 209 253

For the data shown in the histogram, which of the following choices best describes the relationship between the median and the mean?

For the data set below, find the outlier(s). 150 159 159 166 181 164 164 141 169 189 169