f you score in the 80th

a passing grade? Explain. Xe

i. Ye on this exam, does that mean you will receive

Identify the population and the sample: A survey of 1204 vacationers from the

U.S. found that 72% planned on spending at least $1500 on their next trip.

In a history class you are taking, you receive a grade of 74 on your first test. The

to cumins.

class average was 72 with a standard deviation of 5. In a psychology class you are taking, you receive a grade of 80 on your first test. The class average was 77 with a standard deviation of 9. Use z-scores to determine which test you did

better on, comparatively speaking. 7. =

-.

- or z = x- M

Your grade in this class is calculated using the following distribution.

Calculate your final grade, a weighted average, assuming you receive the following grades.

Quizzes

Labs

Test 1

Test 2

Test 3

5%

15%

20%

30%

30%

=100

Quizzes

Labs

Test 1

Test 2

Test 3

80

92

73

48

79

The following is a sample of the time it takes Brookdale students to travel to the school, in minutes:

28 17 40 33 35 22 18 45 29 35 60 25

Make a stem and leaf diagram for the data. Include a

6) Calculate tne class wiath using 5 class

Create a frequency distribution using 5 classes with the class width found in above.

Use the lowest score as a starting point.

Show class limits, class boundaries,

frequencies, relative frequencies, cumulative frequencies, and class midpoints. Round the relative frequencies to 2 decimal places.

Construct a frequency histogram.

Is this graph symmetric, skewed left or skewed right?

			"I 88		+, 133

(12)

6) A random sample of the ages of 100 of the students, faculty, and other employees at Brookdale yielded the following frequency distribution.

(You can round all calculations to the nearest

the correct formula to estimate the mean age. Show all calculations.

Use the correct formula to estimate the standard deviation.

Show all calculations.

For the following problems, identify which type of sampling is used:

2 students from each MATH 131 section are surveyed on their opinion o

All of the students names from our class are put in a hat. 5 names are drawn from the hat and they automatically receive an "A" for the semester.

sample of the number of cigarettes smoked per day is found by standing in front of one of the gazebos and asking the first 30 people who come by to smoke there.

The following data are the number of beds in a sample of 10 hospitals

135 210 176 156 189 177 201 142 173 193

Calculate the mean. Round to the nearest whole number.

Calculate the standard deviation. Round to the nearest whole number.

Calculate the median.

Find Q1, the first quartile.

Find Q3, the third quartile.

313

Find the interquartile range.

g

Make a Box and Whiskers plot.

What does that plot tell you about the data?

According to Chebyshev's Theorem, at least 75% of the data will fall between