Question 2 It would be a one-tailed test. Hypothesis for an one-tail test: Ho:μHo≥μHa Compute Zobt: The Z critical Value = ±1.645 Ho: should be rejected, the researcher should conclude that the new toothpaste prefix better at helping prevent cavities. 95% confident that the population mean is within the range: Question 4 This is a type two error Question 6 Yes, this is a two-tailed Ho:μo≠μ1,μo<μ1 95% Confidence interval: 56.80479 < µ < 61.19521 2.160 No, The researcher should fail to reject Question 8 X^(2 )=2.55 df=1 X^(2 )=3.84 X^2 (1,N=120)=2.55,p>0.05 Reject the Null Hypothesis and concluded the national rate of exercise is greater. Jackson even-numbered Chapter exercises (pp. 273-275) Question 2 He should use an independent t-Test Ho: μo music=μa no music | Ho: μo music ≤ μa no music 6-7.6 √(2.88/9+4.56/9=-1.76 ) Yes, he should reject; he should conclude that studies without music produce higher test grades. yes; it is significant Test Statistic, t: -2.6515, Critical t: ±2.146376, P-Value: 0.0191, Degrees of freedom: 14, 95% Confidence interval: -2.895174 < µ1-µ2 < -0.3048258 Degrees of freedom Degrees of freedom are a collection of sample data comprised of a number of sample values that varies according to dynamic restrictions that may be present. They are the number of data points (N) that can change without affecting the mean of the data set. Jackson p. 210 without affecting the mean. Additionally, they are

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