Question
In: Math
The manufacturer of a portable music player (PMP) has shown that the average life of the...
The manufacturer of a portable music player (PMP) has shown that the average life of the product is 72 months with a standard deviation of 12 months. The manufacturer is considering using a new parts supplier for th PMP's and want to test that the new hard drives will increase the life of the PMP. Before manufacturing the PMP's on a lareg scale, the manufactuer sampled 200 PMP's and found the average life to be 78 months. Test the hypothesis using alpha = .01 that the new hard drives will increase the life of the PMP's. Assume the standard deviation of the new PMP's is the same as the standard deviation of the older model.
A website developer has indicated to potential clients that for the sites he has developed visitors spend an average of 45 minutes per day on the sites. One of his potential clients conducted a survey of 20 visitors to several of his sites and found that the average time spent was 35 minutes with a standard deviation of 7 minutes. Determine if there is sufficient evidence to conclude that the average time spent on the sites is different from what he indicated. Conduct the test at the 0.05 level.
In both cases, in addition to testing the hypotheses using a critical value, also calculate the p value for the test statistic.
Solutions
milcah answered 1 year agoRelated Solutions
The manufacturer of a portable music player (PMP) has shown that the average life of the...
The manufacturer of a portable music player (PMP) has shown
that the average life of the product is 72 months with a standard
deviation of 12 months. The manufacturer is considering using a new
parts supplier for th PMP's and want to test that the new hard
drives will increase the life of the PMP. Before manufacturing the
PMP's on a lareg scale, the manufactuer sampled 200 PMP's and found
the average life to be 78 months. Test the hypothesis...
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you...
Your company's new portable phone/music player/PDA/bottle washer, the RunMan, will compete against the established market leader,...
Your company's new portable phone/music player/PDA/bottle
washer, the RunMan, will compete against the established market
leader, the iNod, in a saturated market. (Thus, for each device you
sell, one fewer iNod is sold.) You are planning to launch the
RunMan with a traveling road show, concentrating on two cities, New
York and Boston. The makers of the iNod will do the same to try to
maintain their sales. If, on a given day, you both go to New York,
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Your company's new portable phone/music player/PDA/bottle washer, the RunMan, will compete against the established market leader,...
Your company's new portable phone/music player/PDA/bottle
washer, the RunMan, will compete against the established market
leader, the iNod, in a saturated market. (Thus, for each device you
sell, one fewer iNod is sold.) You are planning to launch the
RunMan with a traveling road show, concentrating on two cities, New
York and Boston. The makers of the iNod will do the same to try to
maintain their sales. If, on a given day, you both go to New York,
you...
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the music on a music player can be stored digitally in several formats. a popular format...
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A husband and wife, Mike and Lori, share a digital music player that has a feature...
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A husband and wife, Ed and Rina, share a digital music player that has a feature...
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and the rest by Rina. They are interested in determining whether
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player. Suppose that when the player was in the random-selection
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