Question

Four brands of lightbulbs are being considered for use in the final assembly area of the Ford F-150 truck plant in Dearborn, Michigan. The director of purchasing asked for samples of 160 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the 0.05 significance level, is there a difference in the quality of the bulbs? Manufacturer A B C D Unacceptable 11 24 17 33 Acceptable 149 136 143 127 Total 160 160 160 160 Click here for the Excel Data File H0: There is no relationship between quality and manufacturer. H1: There is a relationship. State the decision rule using 0.05 significance level. (Round your answer to 3 decimal places.) Compute the value of chi-square. (Round your answer to 3 decimal places.) What is your decision regarding H0?

Answer #1

Four brands of lightbulbs are being considered for use in the
final assembly area of the Ford F-150 truck plant in Dearborn,
Michigan. The director of purchasing asked for samples of 100 from
each manufacturer. The numbers of acceptable and unacceptable bulbs
from each manufacturer are shown below. At the 0.01 significance
level, is there a difference in the quality of the bulbs? (Round
your answers to 3 decimal places.)
Manufacturer A B C D
Unacceptable 7 7 6 17...

Ms. Lisa Monnin is the budget director for Nexus Media Inc. She
would like to compare the daily travel expenses for the sales staff
and the audit staff. She collected the following sample
information.
Sales ($)
127
137
140
159
136
138
Audit ($)
122
103
127
136
149
120
142
At the 0.025 significance level, can she conclude that the mean
daily expenses are greater for the sales staff than the audit
staff?
State the decision rule. (Round your...

Ms. Lisa Monnin is the budget director for Nexus Media Inc. She
would like to compare the daily travel expenses for the sales staff
and the audit staff. She collected the following sample
information. Sales ($) 129 133 147 159 138 143 Audit ($) 122 103
127 136 149 120 142 At the 0.050 significance level, can she
conclude that the mean daily expenses are greater for the sales
staff than the audit staff? Click here for the Excel Data...

Ms. Lisa Monnin is the budget director for Nexus Media Inc. She
would like to compare the daily travel expenses for the sales staff
and the audit staff. She collected the following sample
information.
Sales ($)
127
137
140
159
136
138
Audit ($)
123
102
128
143
153
127
131
At the 0.050 significance level, can she conclude that the mean
daily expenses are greater for the sales staff than the audit
staff?
State the decision rule. (Round your...

Ms. Lisa Monnin is the budget director for Nexus Media Inc. She
would like to compare the daily travel expenses for the sales staff
and the audit staff. She collected the following sample
information.
Sales ($)
129
135
148
160
135
144
Audit ($)
122
103
127
136
129
120
142
At the 0.025 significance level, can she conclude that the mean
daily expenses are greater for the sales staff than the audit
staff?
State the decision rule. (Round your...

Classic Golf Inc. manages five courses in the Jacksonville,
Florida, area. The director of golf wishes to study the number of
rounds of golf played per weekday at the five courses. He gathered
the following sample information.
Day
Rounds
Monday
120
Tuesday
110
Wednesday
150
Thursday
135
Friday
110
At the 0.05 significance level, is there a difference in the
number of rounds played by day of the week?
H0: Rounds played is the same for each
day.
H1: Rounds...

Ms. Lisa Monnin is the budget director for Nexus Media Inc. She
would like to compare the daily travel expenses for the sales staff
and the audit staff. She collected the following sample
information.
Sales ($)
129
135
148
160
135
144
Audit ($)
122
103
127
136
129
120
142
At the 0.025 significance level, can she conclude that the mean
daily expenses are greater for the sales staff than the audit
staff?
State the decision rule. (Round your...

Classic Golf Inc.
manages five courses in the Jacksonville, Florida, area. The
director of golf wishes to study the number of rounds of golf
played per weekday at the five courses. He gathered the following
sample information.
Day
Rounds
Monday
145
Tuesday
130
Wednesday
105
Thursday
105
Friday
140
At the 0.05
significance level, is there a difference in the number of rounds
played by day of the week?
H0: Rounds played is the same for each
day.
H1: Rounds...

The use of cellular phones in automobiles has increased
dramatically in the last few years. Of concern to traffic experts,
as well as manufacturers of cellular phones, is the effect on
accident rates. Is someone who is using a cellular phone more
likely to be involved in a traffic accident? What is your
conclusion from the following sample information? Use the 0.05
significance level. Had Accident in the Last Year Did Not Have an
Accident in the Last Year Uses...

Ms. Lisa Monnin is the budget director for Nexus Media Inc. She
would like to compare the daily travel expenses for the sales staff
and the audit staff. She collected the following sample
information.
Sales ($)
130
136
147
161
132
147
Audit ($)
131
103
132
132
140
107
132
At the 0.05 significance level, can she conclude that the mean
daily expenses are greater for the sales staff than the audit
staff?
1.
State the decision...

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