Mark the letters A for item 1 on your Scantron form. Two samples of sizes 25 and

Question

Mark the letters A for item 1 on your Scantron form. Two samples of sizes 25 and 35 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal. The number of degrees of freedom of the equal-variances test statistic is: a) 60 b) 59 c) 58 d) 35 The statistical distribution used for testing whether two population variances are equal is the ____ distribution. a) F b)r c) x d) chi^2 In testing whether the means of two normal populations are equal, summary statistics computed for two independent samples are as follows: Assume that the population variances are equal. What is the value of the test statistic you would use to test the claims that the two means are not equal? a) 1.697 b) 1.611 c) 1.553 4) 1.319 A survey done six months ago indicated, of a sample of 1100 registered voters, than 58% would support current mayor. This month a second vey indicated that 48 1/2 % of the 800 voters surveyed would now support the mayor. What is the value of the test statistic to test the claim that support for the mayor has decreased in the months between the first and the second survey? a) -409 b) -4.10 c) -4.14 d) -4.41

Explanation / Answer

as per chegg policies i am answering Q1

df_equal variances = n1+n2-2

=25+35-2

=58

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