Question
Following is a problem description. For all hypothesis tests , you MUST show all 7 steps we have been using and use the P-VALUE METHOD
Following is a problem description. For all hypothesis tests, you MUST show all 7 steps we have been using and use the P-VALUE METHOD to make your decision.For confidence intervals, there are not specific steps, but there is a specific Excel tool for each interval.They should not be done by-hand for this set, nor should you simply use Excel formulas to use it as a calculator.Treat each question as a separate problem -- we use the same data set, but are answering different "research questions". You must attach and clearly label the Excel output that you use in answering the questions as appropriate. The part of the printout you are using must be clearly identified.
Videocassette recorder (VCR) tapes are designed so that users can repeatedly record new material over old material. However, after a number of re-recordings the tape begins to deteriorate. A VCR tape manufacturer is experimenting with a new technology, which hopefully will produce longer-lasting tapes. Thirty of the old-style tapes and 30 utilizing the new technology were used in an experiment. The tapes were used to record and rerecord programs until they began to deteriorate. The number of re-recordings were observed and shown in the accompanying table.It is generally accepted that the number of re-recordings should exceed 55. Any that do not are considered unacceptable.(NOTE:This does not mean you throw them out! They are part of the sample, and we expect some to be unacceptable ... that is why we are testing!)The number of re-recordings is assumed to be normally distributed.
NOTE: use ONLY the P-value method for hypothesis tests. If you include both rules in step 4 or include both in your decision step, I will have to conclude that you do not yet understand the p-value rule.
Old-Style Tapes
60
61
48
51
46
66
66
63
61
73
55
71
71
49
76
47
56
55
60
62
64
52
51
63
64
68
52
47
55
58
New Technology Tapes
68
70
58
74
72
69
77
73
49
59
66
61
52
58
59
66
51
49
62
59
57
51
56
66
50
55
76
63
68
78
Answer the following four questions:
a.) Can we conclude at the 10% significance level that the mean number of re-recordings of the new tapes is greater than 55?
b) Estimate with 90% confidence the difference in the mean number of re-recordings between the old and new tapes and interpret the interval.
c.) Can we infer at the 10% significance level that the variance of the number of re-recordings of the new tape is less than 100?
d.)The quality control manager is not only concerned about the number of re-recordings but is also concerned about the proportion of unacceptable tapes.Do the data allow us to infer at the 10% significance level that the new technology tapes are superior to the old-style tapes in terms of the proportion of unacceptable tapes?
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