Stats 1: Chapters 1-4 (ALEKS Exam 1: Review)
Last week, there were 450 student absences at Kennedy High. The table below summarizes them by the day of the week on which they occurred.
x is 100.8
For each variable, determine whether it is best thought of as discrete or continuous.
1. Discrete/The score (either 0, 1, 2, or 3 with 0 being the worst and 3 being the best) given by a quality-control manager after an equipment inspection. 2. Discrete/The total number of goals scored by a soccer team in a season. 3. Discrete/The number of cellular phones owned by a family of four in Boston. 4. Continuous/The fuel efficiency, in miles per gallon, of an American-made car.
Eric repairs 5 types of electronic devices in his repair shop. The number of each type that he repaired last week is shown in the bar graph below.
1. Which type of device did Eric repair the most often? CD player. 2. How many more computers than televisions did Eric repair? 8 3. On how many types of devices did Eric perform fewer than 12 repairs? 4 types.
The following list contains the number of hours that a sample of 10 middle-school students spent watching television last week. 19, 8, 18, 19, 20, 17, 16 ,11, 5, 18
17. 5 hours
A sample of 15 participants took part in a hearing experiment. Among other things, the absolute hearing threshold (in decibels) was measured for each participant. The 15 measurements were as follows: 25, 22, 18, 35, 37, 34, 31, 39, 39, 36, 36, 36, 33, 33, 30 Draw the histogram for these data using an initial class boundary of 17.5 and a class width of 7. Note that you can add or remove classes from the figure. Label each class with its endpoints.
17.5 - 45.5 2 3 8 2
TrueFun Entertainment sells four types of products: radios, video games, DVDs, and CDs. The numbers sold for 2020 and 2021 are shown in the double bar graph below.
A. Estimate the number of CDs sold in 2021. 950CDs B. Which products sold more in 2020 than in 2021? Video games and DVD's C. Which product sold the most over the two years? Video games
Heather is a stats keeper for the local youth soccer league. At the end of the season, she calculated the average number of passes completed in a game for a random group of 30 players to be.
For Heather's group, identify the population and the sample. Population: All the players in the youth soccer league. Sample: The random group of 30 players.
Variable: 1. Marital status (single or married) 2. Blood type (A, B, AB, or O) 3. End-of-year stock classification (high yield, medium yield, or low yield) 4. Closing price (in dollars) of a stock
Types of Variables: 1. Categorical 2. Categorical 3. Categorical 4. Quantitative
