Question

**Guessing Ages** On the first day of a statistics
class, 37 students took a survey in which they were asked to guess
the age of their instructor. These guesses are given below:

47 43 50 38 37 38 37 42 42 41

40 37 35 33 34 45 45 43 38 39

37 32 40 30 32 45 46 35 40 40

33 42 42 40 46 40 35

a) How many cases are in this data set?

b) How many variables are in this data set? (Classify the type of each variable.)

c) Create an appropriate graphical display for this data.

d) Describe the distribution of guesses.

e) Compute the mean, median, standard deviation, IQR and range for the guesses.

f) Which summary statistics would be most appropriate to summarize the center and variability of the data?

g) If the instructor had shown the class a photo of his 12-year-old son and asked the students to guess his son's age, would you expect the standard deviation of guesses about his son's age be smaller or larger than the standard deviation of guesses about the instructor's age? Explain.

h) One other student, not listed above, misread the instructions and answered with his or her own age (20) rather than guessing the instructor's age. If this student's response were included in the data set, what would happen to the mean? The median? The standard deviation? The IQR?

i) Was this an observational study or an experiment?

Answer #1

weeks 39 42 37 41 39 38 37 35 38 37 45 42 40 38 38 40 40 24 40
37 39 40 39 40 38 38 39 40 39 38 42 36 29 29 35 35 31 42 38 41 43
41 40 38 37 38 41 40 40 38 40 40 42 41 37 39 40 38 39 41 40 39 39
37 41 40 38 44 41 37 36 33 30 36 33 39 39 40 40...

2. In a country called Karpee's Nation, Sixty (60) persons were
asked about their ages in completed years and they responded as
follow:
34 34 40 42 40 42 29 30 28 44 25 37 37 42 29 33
34 29 43 41 25 40 37 33 32 37 40 51 28 27 31 64
38 40 30 41 51 30 48 24 28 33 35 40 31 29 35 46
27 34 28 29 35 30 29...

For each of the data sets provided below, calculate the mean,
median, mode, and standard deviation.
1) Data Set 1:
23, 26, 50, 39, 55, 64, 50, 10, 42, 35, 51, 42, 43, 56, 64, 48,
48, 57, 27, 37
2) Data Set 2:
26, 31, 10, 37, 38, 35, 30, 24, 26, 27, 24, 32, 32, 19, 34, 33,
14, 32, 24, 39, 30

The data set below represents the ages of 36 executives. Find
the percentile that corresponds to an age of 34 years old. 29 29 31
31 31 33 33 34 38 40 40 41 42 44 44 44 45 46 46 46 48 48 51 52 52
53 55 59 61 61 61 64 64 65 65 66
Percentile of 34= _____ (Round to the nearest integer as
needed.)

Question 5
37
39
35
25
20
37
15
22
28
15
33
31
19
19
19
192/5000
The following data measures the age of a random sample of 15
individuals in a group of aerobic exercises.
What percentage of the data is within a standard deviation
A. 40%
B. 25%
C. 60%
D. 45%

Refer to the Body Measurements Female Data Set and Body
Measurements Male Data Set found in StatDisk (Elementary Stats 12th
Edition, sets #1a and 1b) and use columns 5 for HDL. Use a .05
significance level to test the claim that men and women have the
same mean HDL level (High-Density Lipoprotein) female 74 56 70 40
67 96 43 80 77 41 23 76 39 52 38 37 57 81 37 50 73 61 33 41 60 62
67...

A survey of 25 randomly selected customers found the ages shown
(in years). The mean is 32.52 years and the standard deviation is
9.40 years.
37
33
38
24
48
41
39
38
15
26
20
41
37
25
11
28
35
33
28
31
40
30
48
42
25
a) Construct a 99% confidence interval for the mean age of all
customers, assuming that the assumptions and conditions for the
confidence interval have been met. (__,__)
b) How...

2a. Describe the sample and population you are studying.
I am studying customers' satisfaction level with their
car insurance plan.
2b. Calculate the sample mean and sample standard deviation for
your variable. Keep at least four decimal places.
2c. Calculate the standard error and the margin of error for a 90%
confidence interval. Keep at least four decimal places.
Data:
36
18
66
43
28
39
47
40
24
46
48
57
36
58
39
62
43
65
74
36...

The following data represents the age of employment in
years for 25 facilities that were investigated in one study: 38 50
52 56 41 56 50 43 28 45 50 60 40 60 55 35 52 40 47 55 33 35 53 46
51 Put the data in a repeating table of (5) Equal Categories. Then
compare the mean values for the random (ungrouped) data and the
mean for the data, which is tabulated in the iterative table.
.
I...

The following are ages of of the signers of the Declaration of
Independence. 35, 62, 52, 34, 35, 63, 48, 30, 35, 32, 36, 44, 50,
40, 39, 42, 46, 50, 45 Send data to Excel Find th and th
percentiles for these ages. (If necessary, consult a list of
formulas.) (a) The th percentile: (b) The th percentile:
QUESTION 2 Problem Page Here are the shopping times (in minutes)
for a sample of shoppers at a particular shoe store:...

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