Unit Test — Unit test Answers

The following table shows the life expectancy for women in the United States for selected years in the period 1975-2000. Year 1975 1980 1985 1990 1995 2000 Women 76.6 77.4 78.2 78.8 78.9 80.0 Which graph makes the increase in life expectancy from 1975-2000 appear to be relatively small? a. b. c. d. Please select the best answer from the choices provided

Forty families were surveyed and asked to record the number of hours per week their television was in use. The results are shown in this frequency table. Number of Hours Frequency 0-9 1 10-19 6 20-29 15 30-39 12 40-49 2 50-59 4 Which histogram is an accurate representation of the data? a. b. c. d. Please select the best answer from the choices provided

Compute the standard deviation for the set of data. 2, 5, 6, 8, 14

The histogram below represents the number of points Mandy scored per game. The graph makes the data appear symmetric when it is actually skewed. How can the graph be adjusted to show the skew?

A convenience sample differs from a voluntary sample in that

Forty people were randomly sampled and surveyed as to the number of pets in their household. The results are listed below. 1 1 0 4 1 0 1 2 3 5 2 0 2 0 3 1 2 0 0 1 0 4 0 0 3 1 0 0 2 1 0 0 4 0 1 3 5 0 2 1 What is the BEST frequency table for these data? a. c. b. d. Please select the best answer from the choices provided

During the spring and summer, a concession stand at a community Little League baseball game field sells soft drinks and other refreshments. To prepare for the season, the concession owner refers to the previous year’s files, in which he had recorded the daily soft drink sales (in gallons) and the average daily temperature (in degrees Fahrenheit). The data is shown in the table below. t, Temperature g, Soft Drink Sales (gal) 52 35 55 42 61 50 66 53 72 66 75 68 77 72 84 80 90 84 94 91 97 95 If the data points (t, g) are plotted on a graph, it will look like the following graph: Using the coordinates of two points (84, 80) and (74, 65), determine the slope of the line of best fit.

The mean test scores with standard deviations of four English classes are given below.ClassMeanStandard DeviationMrs. Jones891.9Mrs. Rijo821.4Mr. Phan733.4Mrs. Scott906.1Which statement is most likely to be true?

The graph below is used by company 2 to show the average monthly electric cost based on the electricity provider.How could the graph be redrawn so that the difference in monthly electric cost does not appear as great?

Determine whether the graph shows a positive correlation, a negative correlation, or no correlation. If there is a positive or negative correlation, describe its meaning in the situation. Average Cycling Speed

Emi computes the mean and variance for the population data set 87, 46, 90, 78, and 89. She finds the mean is 78. Her steps for finding the variance are shown below.What is the first error she made in computing the variance?

The bar graph in the following graphic represents fictional net exports in billions of dollars for five countries. Net exports are obtained by subtracting total imports from total exports; a negative net export means the country imported more goods than it exported. Estimate the net amount of exports for Spain.

To conduct a survey about the type of phone service most people in Greenville prefer, 10 different blocks in the neighborhood are chosen. On these 10 blocks, 10 houses are selected at random, and then each resident of each of those houses is interviewed. This type of sampling method is

A high school student volunteers to present a report to the administration about the types of lunches students prefer. He surveys members of his class and records their choices. What type of sampling did the student use?

The mean game scores and standard deviations of four seasons of a football team are given below.SeasonMeanStandard Deviation2005193.52006212.82007121.0200894.0Which statement must be true?

The stem-and-leaf plot below shows the number of pages each student in a class read the previous evening.Which statement is true about the data set?

The hourly wages earned by 20 employees are shown in the first box-and-whisker plot below. The person earning $15 per hour quits and is replaced with a person earning $8 per hour. The graph of the resulting salaries is shown in plot 2.Plot 1 Plot 2 How does the mean and median change from plot 1 to plot 2?

The difference between an observational study and an experiment is that

The mean of a set of credit scores is and . Which statement must be true about z694?

Yuri computes the mean and standard deviation for the sample data set 12, 14, 9, and 21. He finds the mean is 14. His steps for finding the standard deviation are below.What is the first error he made in computing the standard deviation?