Chapter 7
An Introduction to Psychological Statistics · 7 exercises
Problem 1
In your own words, explain what the null hypothesis is.
5 step solution
Problem 2
What are Type I and Type II Errors?
4 step solution
Problem 4
Why do we phrase null and alternative hypotheses with population parameters and not sample means?
3 step solution
Problem 5
If our null hypothesis is \({ }^{4} H_{0}: \mu=40^{\prime \prime}\), what are the three possible alternative hypotheses?
4 step solution
Problem 6
Why do we state our hypotheses and decision criteria before we collect our data?
4 step solution
Problem 8
Determine whether you would reject or fail to reject the null hypothesis in the following situations: a. \(z=1.99\), two-tailed test at \(\alpha=0.05\) b. \(z=0.34, z *=1.645\) c. \(p=0.03, \alpha=0.05\) d. \(p=0.015, \alpha=0.01\)
5 step solution
Problem 10
You get hired as a server at a local restaurant, and the manager tells you that servers' tips are $$\$ 42$$ on average but vary about $$\$ 12(\mu=42, \sigma=12)$$. You decide to track your tips to see if you make a different amount, but because this is your first job as a server, you don't know if you will make more or less in tips. After working 16 shifts. you find that your average nightly amount is $$\$ 44.50$$ from tips. Test for a difference between this value and the population mean at the \(\alpha=0.05\) level of significance.
6 step solution