About how many participants are needed in each group for 80% power in each of the following planned studies, using the analysis of variance with p < 0.05? Use the accompanying table of approximate numbers of participants needed. Predicted Effect Size Number of Groups (a) Small 5 (b) Medium 3 (c) Small (d) Large 4

Using traditional methods it takes 8.8 hours to receive a basic driving license. A new license training method using Computer-Aided Instruction (CAI) has been proposed. A researcher used the technique on 17 students and observed that they had a mean of 8.4 hours with a variance of 2.89. Is there evidence at the 0.1 level that the technique performs differently than the traditional method? Assume the population distribution is approximately normal. Step 4 of 5 :   Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places.

Hi, I'm stuck with question 2. Question 1 given the example for this question

A new study has found that, on average, 6- to 12-year-old children are spending less time on household chores today compared to 1981 levels. Suppose two samples representative of the study's results report the following summary statistics for the two periods. 1981 Levels 2008 Levels 24 minutes 19 minutes 51 = 3.5 minutes 52 - 4.3 minutes ni = 30 n2 - 30 Which of the following is the correct value of the test statistic assuming that the unknown population variances are equal? Multiple Cholce Z = -4.94 tss = 4.94 Z = 4.94 t59 = -4.94

On a particular proposal of national importance, males and females cast votes as included in the following table   In Favor Opposed Undecided Male 90 65 43 Female 115 74 32 Suggest an appropriate test for the data and analyze it at 1% level of significance.

Suppose IQ scores were obtained for 20 randomly selected sets of siblings. The 20 pairs of measurements yield x=99.75​, y=101​, r=0.921​, ​P-value=​0.000, and y=2.6+0.99x​, where x represents the IQ score of the older child. Find the best predicted value of y given that the older child has an IQ of 102​? Use a significance level of 0.05.

At a 0.05, test to see if the population variances from which the following samples were drawn are equal. The test statistic is Group 1 n₁ = 21 Group 2 n₂ = 19 $1 = 20 S2 = 18 (A) 1.56 (B) 1.23 (C) 1.26 (D) 1.11