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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
The trail was repeated 54 times with 22 correct identifications and 32 wrong identification.
Construct a 94% confidence interval for the true mean fill volume for all jugs of softener.
In a bag there are 20 marbles. The colors of the marbles are as follows: red - 5; blue - 8; green - 3; yellow - 4.
If random sample of thirty six customer transactions points out that sample mean withdrawal amount is $172, is there evidence to think that population mean withdrawal amount is no longer $160? Determine the mean of data above?
Assuming that n = 6 for both samples, calculate each of the sample variances, then calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances.
Determine the probability that computer will fail within 12 months?
An elementary school principal would like to know how many hours the students spend watching TV each day. A sample of n = 25 children is selected, and a survey is sent to each child's parents.
Base on a survey of over 10,000 households, the number of televisions in the home was recorded as given in the table below. Based on the data, find the expected number of televisions in a home.
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
Misery loves company. It is time for the PE (professional engineer's exam). The results of the national test were normally distributed around the mean score of 70.
From National Weather Service records, the annual snowfall in the TopKick Mountains has a mean of 92 inches and a standard deviation ? of 12 inches.
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
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