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Here are heart rates for a sample of 30 students before and after a class break. At alpha =.05, was there a significant diffeence in the mean heart rate?
(a) State the hypotheses.
(b) State the decision rule and sketch it.
(c) Find the test statistic
(d) Make a decision.
(e) Find the p-value and interpret it.
Hear Rate Before and After Class Break
Student Before After
1 60 62
2 70 76
3 77 78
4 80 83
5 82 82
6 82 83
7 41 66
8 65 63
9 58 60
10 50 54
11 82 93
12 56 55
13 71 67
14 67 68
15 66 75
16 70 64
17 69 66
18 64 69
19 70 73
20 59 58
21 62 65
22 66 68
23 81 77
24 56 57
25 64 62
26 78 79
27 75 74
28 66 67
29 59 63
30 98 82
For the sheet-metal stamping machine in certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours.
Assume that correlation coefficient between 2 variables is nearly zero. What does this say about relationship between them?
We are interested in determining whether or not the variances of the sales at two music stores (A & B) are equal. A sample of 10 days of sales at store A has a standard deviation of 30, while a sample of 16 days of sales from store B has a standar..
Either summarize your design or give an appropriate layout with table.
Illustrate what does weighting add to usefulness of moving averages and explain how is it done. The yield on a thirty year treasury note at the end of every year since 1990 is recorded below.
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Service A delivers the document with probability 0.9, Service B with probability 0.9 and Service C with probability 0.8. What is the probability that at least one copy of the document will be delivered on time?
A survey of 100 clients of pacific gas and electric resulted in the following frequency distribution of monthly charges.
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