Chapter 8:

Q#1: The mean salary for RN &RRT is $90,000. This is an example of a Hypothesis. Ture or false?

Q#2: Answer the following questions.

a. In an alternative hypothesis, how many options are there?

b. If question signal or mentioned these key word- below / few / less / less than / decrease, which tailed we select?

Q#3: Find the Null and alternative hypothesis for the questions below;

a.College Professors have incomes with a standard deviation that islessthan$21,000.Arecent study of225College Professors income showed a standard deviation of $24,750.

b. The mean IQ score of statistics professors isgreater than128. Sample data shows n=15, sample mean = 110 and sample standard deviation is 15.

c.The mean weight of super model winners is108pounds. A study of25randomly selected super model resulted in a mean winner is less than theweight of115pounds.

Chapter 9:

Q#4a: Find the P value If the Z<-0.70.

b. Find the P-value if Z >2.08.

Q#5: A medical study followed asampleof 14 heart patients who had received electronic pacemakers.The time (in months) to the first electrical malfunction was recorded as follows:

18,14,20,16,22,14,12,8,12,24,6,10,20, 16

a) Calculate the estimatedstandard error of the mean

b) Determine thecritical value of tfor alpa = 0.05.

c) Find the 95%confidence intervalfor the population mean.

Q#6: The researcher recorded the amount of time each bird spent in the plain chamber during a 60-minute session. Suppose the study produced a mean ofM= 34.5 minutes on the plain chamber withSS= 210 for a sample ofn= 14 birds. Construct the 99% confidence interval to estimate the mean amount of time spent on the plain side for the population of birds.

Q#7: Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years (Twenge, 2000). In the 1950s, the average score on the Child Manifest Anxiety Scale was = 14.1. A sample ofn= 15 of today's children produces a mean score ofM= 23.3 with SS= 240.Based on the sample, has there been a significant change in the average level of anxiety since the1950s? Use a two-tailed test with = 0.01.