Mindtap Psychology, 1 Term (6 Months) Printed Access Card For Gravetter/wallnau's Statistics For The Behavioral Sciences, 10th
10th Edition
ISBN: 9781305647329
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Textbook Question
Chapter 1, Problem 11P
A research study reports that alcohol consumption is significantly higher for students at a state university than for students at a religious college (Wells, 2010). Is this study an example of an experiment? Explain why or why not.
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Example 4 (Part 2) We can use Statkey to take 50 different random samples of size 20 each, find the mean of
each sample, and compute a confidence interval for each one. The graph of the sampling distribution of the means
is on the left below, and that of the 50 confidence intervals is on the right.
1. What does each dot on the left hand dotplot represent?
StatKey Sampling Distribution for a Mean
Percent with Internet Access (Countries) ▾
Show Data Table Edit Data
Choose samples of size n =
20
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Generate 1 Sample
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Sampling Dotplot of Mean
Left Tail Two-Tail Right Tail
60
50
40
40
30
20
20
10
samples = 50
mean = 41.626
std. error = 5.089
:
.:
:
::
0
25
30
35
40
45
50
55
60
41.626
Data Plots
Confidence Intervals
95%->
Confidence Intervals
Coverage
48/50 = 96%
20
40
60
80
2. Circle the confidence intervals that failed to capture the true mean.
3. Circle the sample means that produced those…
Example 4 (Part 1) One of the datasets in the Lock book
contains information about 215 countries of the world. One
of the variables is the percentage of people in the country
who have access to the internet. We have data for 203 of
those countries. The plot on the right shows a dotplot of
the data.
1. What are the cases?
Population
n = 203, mean = 43.024
median = 43.5, stdev = 29.259
20
2. What does each dot on the dotplot represent?
15
10
5
20
40
43.024
60
80
3. What type of data is do we collect from the cases, quantitative or categorical?
Let x be a random variable that represents the percentage of successful free throws a professional basketball player makes in a season. Let y be a random variable that represents the percentage of successful field goals a professional basketball player makes in a season. A random sample of n =6 professional basketball players gave the following information.
x
63
79
70
80
84
87
y
46
49
45
55
57
58
Find Se. Round your answer to three decimal places.
Chapter 1 Solutions
Mindtap Psychology, 1 Term (6 Months) Printed Access Card For Gravetter/wallnau's Statistics For The Behavioral Sciences, 10th
Ch. 1 - A researcher interested in the texting habits of...Ch. 1 - 2. Define the terms population, sample, parameter...Ch. 1 - WW3. Statistical methods are classified into two...Ch. 1 - Define the concept of sampling error and explain...Ch. 1 - Describe the data for a correlational research...Ch. 1 - Describe how the goal of an experimental research...Ch. 1 - Stephens, Atkins, and Kingston (2009) conducted an...Ch. 1 - 8. 2 and age 4 compared to children who drank...Ch. 1 - Gentile, Lynch, Linder, and Walsh (2004) surveyed...Ch. 1 - 10. Weinstein, McDermott, and Roediger (2010)...
Ch. 1 - A research study reports that alcohol consumption...Ch. 1 - 12. In an experiment examining the effects Tai Chi...Ch. 1 - A tax form asks people to identify their annual...Ch. 1 - Four scales of measurement were introduced in this...Ch. 1 - Knight and Haslam (2010) found that office workers...Ch. 1 - 16. Explain why honesty is a hypothetical...Ch. 1 - Ford and Torok (2008) found that motivational...Ch. 1 - 18 . 18. For the following scores, find the value...Ch. 1 - 19. For the following scores, find the value of...Ch. 1 - 20. For the following scores, find the value of...Ch. 1 - Two scores, X and Y, are recorded for each of n =...Ch. 1 - 22. Use summation notation to express each of the...Ch. 1 - 23. For the following set of scores, find the...
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