Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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Textbook Question
Chapter 5, Problem 31P
Use the following information to answer the next eight exercises. A distribution is given as X ~U(0, 12).
Draw the graph of the distribution for P(x >9).
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A research firm claims that the distribution of the days of the week that people are most likely to order food for delivery is different from the distribution
shown in the pie chart. You randomly select 496 people and record which day of the week each is most likely to order food for delivery. The table to the right
shows the results. At a = 0.10, test the research firm's claim.
Day
Frequency, f
42
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
11
24
W Click the icon for the pie chart of the distribution.
49
47
165
158
State Ho and H, and identify the claim.
Họ: The distribution of the days people order food for delivery is as shown in the pie chart.
Ha: The distribution of the days people order food for delivery differs from the expected distribution.
Which hypothesis is the claim?
o Ho
Calculate the test statistic.
X = 25.425 (Round to three decimal places as needed.)
Determine the P-value.
P= 0.000 (Round to three decimal places as needed.)
Decide whether to reject or fail…
A research firm claims that the distribution of the days of the week that people are most likely to order food for delivery is different from the distribution
shown in the pie chart. You randomly select 493 people and record which day of the week each is most likely to order food for delivery. The table to the right
shows the results. At a = 0.01, test the research firm's claim.
Day
Frequency, f
47
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
15
27
W Click the icon for the pie chart of the distribution.
49
41
164
150
State Ho and H, and identify the claim.
Graph/Chart
Ho: The distribution of the days people order food for delivery
H: The distribution of the days people order food for delivery
Food at your door
I Sunday 8%
Which hypothesis is the claim?
I Monday 3%
O Ho
O Tuesday 6%
O H.
O Wednesday 14%
I Thursday 11%
Calculate the test statistic.
I Friday 36%
X = (Round to three decimal places as needed.)
I Saturday 22%
Determine the P-value.
P= (Round to three decimal…
Suppose that 95% of the bags of certain fertilizer mix weigh between 49 and 53 pounds. Averages of three succesive bags were plotted, and 47.5% of these were observed to lie between 51 and X pounds. Estimate the value of X. State assumptions you make and say whether these assumptions are likely to be true for this example.
Chapter 5 Solutions
Introductory Statistics
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