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The concept of hypothesis testing and significance levels through an example of testing if older students have better study habits and attitudes towards school using the survey of study habits and attitudes (ssha) test. It covers the main concepts of hypothesis testing, null and alternative hypotheses, p-value, and guidelines for interpreting p-values.
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least 30 years old. The sample results are = 125.7 ands = 30.1. Is this good evidence
If there is a significant difference, estimate the difference with a 98% confidence interval. Interpret your interval estimate.
Machine Operator 1 2 3 4 5 6 7 8
Machine 1 53 60 58 48 46 54 62 49
Machine 2 50 55 56 44 45 50 57 47
Perform a hypothesis test to decide if high lysine corn is effective in increasing weight gain.
If you find that the high lysine corn does yield higher weight gains, estimate the mean extra weight gain with a 95% confidence interval.
0.861 0.864 0.882 0.887 0.858 0.879 0.887 0.876 0. 0.894 0.884 0.882 0.869 0.859 0.887 0.875 0.863 0. 0.882 0.862 0.906 0.880 0.877 0.864 0.873 0.860 0. 0.869 0.877 0.863 0.875 0.883 0.872 0.879 0.
The second method produces washers with the following diameters (in inches).
0.705 0.703 0.715 0.711 0.690 0.720 0.702 0.686 0. 0.712 0.718 0.695 0.708 0.695 0.699 0.715 0.691 0. 0.680 0.703 0.697 0.694 0.714 0.694 0.672 0.688 0. 0.715 0.709 0.698 0.696 0.700 0.706 0.695 0.
Do the data show a significant difference in the average diameters for the two methods? If yes, estimate the difference with a 95% confidence interval. Interpret your interval estimate.
Perform a hypothesis test to decide if the instructional video seems effective. If the instructional video is effective, use a 95% confidence interval to estimate the level of improvement in the ability of Little League pitchers to throw strikes.
Number of strikes (out of 50)
Number of Strikes (out of 50)
Before After Before After
28 35 33 33
29 36 33 35
30 32 34 32
32 28 34 30
32 30 34 33
32 31 35 34
32 32 36 37
32 34 36 33
32 35 37 35
33 36 37 32