Homework Answers
1) Option - E) 
2) Option - C) The lifetime of remote control buttons must be normally distributed.
3) The test statistic is
4) DF = 26 - 1 = 25
P-value = P(T > 2.27)
= 1 - P(T < 2.27)
= 1 - 0.9840
= 0.016
5) Cohen's d = 
= (1255 - 1205)/112.3
= 0.445
6) small to moderate effect size and little evidence.
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(8 points) A electronics manufacturer has developed a new type of remote control button that is designed to operate lon...
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HW09: Problem 6 Problem Value: 8 point(s). Problem Score: 0%. Attempts Remaining: 3 attempts. (8 points) A electronics manufacturer has developed a new type of remote control button that is designed to operate longer before failing to work consistently. A random sample of 26 of the new buttons is selected and each is tested in continuous operation until it fails to work consistently. The resulting lifetimes are found to have a sample mean of x = 1255.5 hours and a...
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5) (7 points) A local brewery wishes to ensure that an average of 12 ounces of...
5) (7 points) A local brewery wishes to ensure that an average
of 12 ounces of beer is used to fill each bottle. In order to
analyze the accuracy of the bottling process, the bottler takes a
random sample of 16 bottles with the following results. The data
are shown below.
1. Which set of hypotheses should we use to determine if the
mean bottle fill is different from 12 ounces?
A. ?0:?=12 ??. ??:?<12H0:μ=12 vs.
HA:μ<12
B. ?0:?=12 ??....
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Probler 3 Problem 4 Problem 5 Problem 6 (8 points) A lectronics manufacturer has developed a new type of remote control button that is designed to operate longer before failing to work consistently. A random sample of 17 of the new buttons is selected and each is tested in continuous operation until it fails to work consistently. The resulting lifetimes are found to have a sample mean of x = 1245.6 hours and a sample standard deviation of 114.4. Independent...
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must maintain a dry field. A new bonding adhesive has been developed to eliminate the necessity of a dry field. However, there is concern that the When bonding teeth, new bonding adhesive is not as strong as the current standard, a composite adhesive. Tests on a sample of 8 extracted teeth bonded with the new adhesive resulted in a mean breaking strength (after 24 hours of x=5.35 Mpa and a standard deviation of s=0.39 Mpa. Orthodontists want to know if...
5) (7 points) A local brewery wishes to ensure that an average
of 12 ounces of beer is used to fill each bottle. In order to
analyze the accuracy of the bottling process, the bottler takes a
random sample of 16 bottles with the following results. The data
are shown below.
1. Which set of hypotheses should we use to determine if the
mean bottle fill is different from 12 ounces?
A. ?0:?=12 ??. ??:?<12H0:μ=12 vs.
HA:μ<12
B. ?0:?=12 ??....
I will be sure to rate well, Thanks!
The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,498 hours. The population standard deviation is 700 hours. A random sample of 49 light bulbs indicates a sample mean life of 7,348 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,498 hourst b. Compute...
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4) (8 points) In 2015, the average cost of attendance at public
2-year colleges and technical schools across the United States was
$12,260. A researcher wants to know if the 2-year colleges in
Michigan are less expensive.
1. A QQ-plot of the cost of attendance at public 2-year colleges
and technical schools is shown below. Based on this plot, is it
reasonable to use this data to evaluate the research question? Why
or why not?
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