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Questions 1 – 4 use the following table and shows the lengths (in minutes) of 64 international phone calls using a prepaid calling card.
| Length of call (minutes) | Frequency | Relative frequency | Cum. Relative Freq. |
|---|---|---|---|
| 4 | 25 | 0.3906 | |
| 14 | 15 | ||
| 24 | 10 | 0.1563 | |
| 34 | 9 | 0.1406 | |
| 44 | 4 | 0.0625 | |
| 54 | 1 | 0.0156 | 1.00 |
The histogram of this data looks to be:
A
Which of the following box plots most accurately displays the data?
B
What percent of telephone calls were more than 24 minutes?
B
What can be said about a set of data when its standard deviation is small (but not zero)?
D
Questions 6 and 7, refer to the following: A sample of students was taken to determine pulse rate. The data is shown:
| Pulse rate-beats per minute | 54 | 58 | 65 | 68 | 72 | 76 | 80 | 90 | 98 |
| Frequency (# of Students) | 1 | 3 | 6 | 8 | 5 | 3 | 8 | 4 | 2 |
Find the median and mode(s).
A
Out of the entire college population of 24,000 students, approximately what percent of students are expected to have a pulse rate of 65?
D
For questions 8 and 9, refer to the following: By determining the average number of people in a car using the "Diamond" Carpool Lane, the California Highway Patrol is trying to decide if the number of people in a car using the "Diamond" Carpool Lane should be increased from 2 to 3.
The average number of people per car for all cars using the "Diamond" Carpool Lane is called the:
D
The number of people in 1 car is called the:
C
I toss a fair coin a large number of times. Assuming the tosses are independent, which of the following is true?
B
Questions 11 - 13, refer to the following: A sample of twenty people went on a cruise to Alaska. Their two-week weight gain is shown below (a weight loss is shown by a negative number.)
| Weight Gain | Frequency |
|---|---|
| -2 | 4 |
| 0 | 5 |
| 2 | 8 |
| 5 | 2 |
| 9 | 1 |
The middle 50% of the data is between ________ and _________.
A
Find the average weight gain (in pounds).
A
What weight gain is 3 standard deviations above the mean (in pounds)?
A
For questions 14 - 19, use the following information: Kim, a personal trainer, was interested in whether or not there was a linear relationship between the number of visits her clients made to the gym each week and the average amount of time her clients exercised per visit. She took the following data.
| Client | 1 | 2 | 3 | 4 | 5 | 6 |
| Number of visits per week | 1 | 3 | 4 | 2 | 3 | 5 |
| Average time spent exercising per visit (hours) | 2 | 1.5 | 1 | 2 | 2 | 0.30 |
Is the correlation coefficient significant?
A
Using the best fit line, estimate the average time spent exercising per visit for 4 visits per week.
B
Kim used the best fit line to estimate the average time spent exercising per visit for her client Toby who visited the gym 7 times per week. Does the least squares line give an accurate estimate?
B
If the correlation coefficient is –1, which answer is correct?
D
A scatter plot shows:
A
Suppose we are interested in the average grade on the first math 10 test taken by all students at De Anza during the spring 2002 quarter. We randomly choose 3 students from each of the spring 2002 Math 10 classes as our sample. This sampling technique is
B
Tracy works at a local indoor soccer arena. He is interested in the proportion of people entering the area who spend money in the arena store. One night while he is working, Tracy counts the first 20 people who buy goods in the arena store.
D
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