Basic Statistics
TESTS FOR EQUALITY OFTWO MEANS: UNPAIRED DATA 105 a single population and randomly assign subjects to two treatment groups. This ...
106 TESTS OF HYPOTHESES ON POPULATION MEANS (as usual the d.f.’s are the numbers used in the denominator of the estimate of the ...
TESTING FOR EQUALITY OF MEANS: PAIRED DATA 107 Table 8.3 and Their 10 Siblings Age at First Word in Months for 10 Children with ...
108 TESTS OF HYPOTHESES ON POPULATION MEANS one-sided, upper tail test is appropriate. The null hypothesis is HO : pdso, so if i ...
CONCEPTS USED IN STATISTICAL TESTING 109 if it actually is 12.0, the mistake of rejecting p = 12.0 will occur only 5% of the tim ...
110 TESTS OF HYPOTHESES ON POPULATION MEANS Table 8.4 Decisions and Outcomes Accept Ho Reject HO HO true Correct decision Type I ...
SAMPLE SIZE 11 1 is 1 - ,O, since the total area under the curve is 1. We can see that the type 11 error is quite large. We can ...
1 12 TESTS OF HYPOTHESES ON POPULATION MEANS Figure 8.4 Sampling distribution of x when true ,u = .6 with the shaded area ,B. (a ...
CONFIDENCE INTERVALS VERSUS TESTS 1 13 We next decide what diference between p1 and p2 we wish to detect. Note that the actual v ...
11 4 TESTS OF HYPOTHESES ON POPULATION MEANS out that if one wants to test whether the difference between two point estimates (s ...
REPORTING THE RESULTS 1 15 the intervals. When using t, it may be difficult to find tabled values close to those you want. The s ...
116 8.3 8.4 8.5 8.6 TESTS OF HYPOTHESES ON POPULATION MEANS In Problem 7.8, make a test to determine whether or not isoniazid tr ...
CHAPTER 9 VARIANCES: ESTIMATION AND TESTS In Chapter 5 we discussed the importance of variability, and by now it should be appar ...
11 8 VARIANCES: ESTIMATION AND TESTS brief discussion is given of the use of nonparametric tests that do not require a normal di ...
TESTING WHETHER TWO VARIANCES ARE EQUAL: F TEST 1 19 I Figure 9.1 The F distribution. variances, and a preliminary test of that ...
120 VARIANCES: ESTIMATION AND TESTS In entering the F tables, the d.f.’s for the numerator are 721 - 1 = 11 and the d.f.’s for t ...
APPROXIMATE TTEST 121 computing the variance. When unequal variances are found, the first thing that should be examined is why t ...
122 VARIANCES: ESTIMATION AND TESTS We compute $/n1 = ,0535 and s:/n2 = .8333 and enter them into the formula for the d.f.’s: (. ...
PROBLEMS 123 PROBLEMS 9.1 9.2 9.3 9.4 In Problem 7.5, use the standard deviations for bleeding times calculated from 43 bleeding ...
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