# Answers to Test Yourself

Below are answers to the chapter Test Yourself feature.

**(1) **c **(2)** a **(3)** d **(4) **b **(5)** b **(6)** a **(7) **a **(8a)** The population mean is equal for classical, country, and rock music. **(8b) **Yes, you reject the null. The *p *value is less than alpha (.05). **(8c) **There is a significant difference between types of music. **(9) **There is a significant main effect of group. The value of *F* = 6.75 is larger than the critical value (3.35) **(10) **A mean of 1 indicates a balance in variance when comparing between-group and within-group means. **(11a)**

**(11b) **Dosage does affect mood, *F*(2,12) = 7.41, *p* = .008. **(11c)** The 10 mg dose showed a higher mood score than the 25 mg dose, *p* = .008, but no other comparisons were significant, *p*’s > .08. **(12) **Type of flight does affect number of adjustment days, *F*(2,15) = 41.03, *p* < .001. Eastbound flights produced the longest adjustment (*M* = 6.0, *SD* = 1.41), followed by Westbound flights (*M* = .5, *SD* = 1.05), and the same time zone flights produced the smallest adjustment (*M* = 0.5, *SD* = 0.55).