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Moore - The Basic Practice of Statistics 5/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 11 / 25

Due : Sunday, January 27, 2030 23:30 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5
–/4 –/9 –/4 –/3 –/5
Total
11/25 (44.0%)

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    Here are some textbook questions from The Basic Practice of Statistics 5/e by Thomas A. Moore published by W. H. Freeman. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice.

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1. –/4 points MBasicStat5 1.E.001. My Notes
Question Part
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–/4
 
Here is a small part of a data set that describes the fuel economy (in miles per gallon) of 2006 model motor vehicles.
Make and modelVehicle
type		Transmission
type		Number of
cylinders		City
MPG		Highway
MPG
.
.
.
Audi TT RoadsterTwo-seaterManual42029
Cadillac CTSMidsizeAutomatic61827
Dodge Ram 1500Standard pickup truckAutomatic81419
Ford FocusCompactAutomatic42632
.
.
.
(a) What are the individuals in this data set?
    

(b) For each individual, what variables are given? (Select all that apply.)

Which of these variables are categorical? (Select all that apply.)

Which of these variables are quantitative? (Select all that apply.)

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2. –/9 points MBasicStat5 2.E.032. My Notes
Question Part
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–/9
 
We asked the students in a large first-year college class how many minutes they studied on a typical weeknight. Below are the responses of random samples of 30 women and 30 men from the class. The most common methods for formal comparison of two groups use x and s to summarize the data.
Women Men
197
120
150
200
120
90		 120
180
120
150
60
240		 180
120
180
180
120
180		 375
240
180
150
180
115		 240
170
150
180
180
120		 132
90
150
240
30
0		 120
45
120
60
230
200		 30
30
60
120
120
120		 90
120
240
60
95
120		 200
75
315
30
150
180
(a) What kinds of distributions are best summarized by x and s?
    


(b) One student in each group claimed to study at least 300 minutes (five hours) per night. How much does removing these observations change x and s for each group? (Use 1 decimal place.)
Women Men
x s       x s
Before
After
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3. –/4 points MBasicStat5 3.E.028. My Notes
Question Part
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1 2 3 4
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–/4
 
Use Table A to find the proportion of observations from a standard Normal distribution that falls in each of the following regions. In each case, sketch a standard Normal curve and shade the area representing the region. (Use 4 decimal places.)
(a) z ≤ -2.75
p-value =

(b) z ≥ -2.75
p-value =

(c) z > 1.76
p-value =

(d) -2.75 < z < 1.76
p-value =
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4. –/3 points MBasicStat5 4.E.026. My Notes
Question Part
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1 2 3
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–/3
 
A student wonders if tall women tend to date taller men than do short women. She measures herself, her dormitory roommate, and the women in the adjoining rooms; then she measures the next man each woman dates. Here are the data (heights in inches).
Women (x) 65 64 65 65 70 65
Men (y) 73 67 71 68 71 65
(a) Make a scatterplot of these data. (Do this on paper. Your instructor may ask you to turn in this work.) Based on the scatterplot, do you expect the correlation to be positive or negative? Near ± 1 or not?
    


(b) Find the correlation r between the heights of the men and women. (Give answer to 3 decimal places.)
r =

Do the data show that taller women tend to date taller men?
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5. –/5 points MBasicStat5 5.E.034. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
–/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50
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–/5
 
How strongly do physical characteristics of sisters and brothers correlate? Here are data on the heights (in inches) of 11 adult pairs.
Brother 71 67 66 70 70 71 70 73 72 65 66
Sister 69 64 65 63 65 62 65 64 66 59 62
(a) Use your calculator or software to find the correlation. (Use 3 decimal places.)
r =

Give the least-squares line for predicting sister's height from brother's height. (Use 3 decimal places.)
y hat = + x.

Make a scatterplot that includes this line. (Do this on paper. Your instructor may ask you to turn in this work.)

(b) Damien is 73 inches tall. Predict the height of his sister Tonya. (Use 1 decimal place.)
y hat = inches
Based on the scatterplot and the correlation r, do you expect your prediction to be very accurate? Why? (Select all that apply.)

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