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Question - Psychology and Human Behavior As a result of stricter training requirements, fewer big fires, higher-paying jobs in cities, and changes in society, the number of volunteer firefighters is declining. Approximately three-fourths of all firefighters in the United States are volunteers, and the total number of volunteer firefighters has decreased steadily over the last two decades. Suppose 30 U.S. firefighters are selected at random.
a. Find the probability that exactly 22 of the firefighters are volunteers.
b. Find the probability that more than 25 of the firefighters are volunteers.
c. Suppose 17 of the firefighters are volunteers. Is there any evidence to suggest that the proportion of volunteer firefighters has decreased? Justify your answer.
d. Suppose 50 firefighters are selected at random from the West and 50 firefighters are selected from the Northeast. What is the probability that at least 40 of the firefighters will be volunteers in both groups?
How do research questions frame studies? What type of wording would lead to a qualitative study? A quantitative one?
Charmers' Candy Store sells wrapped hard candies in the following flavors: strawberry, blueberry, lemon, lime, and orange. They advertise that there are equal proportions of each flavor in every size of their candy boxes.
You will be using the 10 scholarly resources (empirical articles or dissertations) and a draft of your 10 Strategic Points starting Tuesday to work on developing or revising your 10 Strategic Points and applying them to your Prospectus or Proposal..
Give the Z- score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected
a cola-dispensing machine is set to dispense a mean of 2.026 liters into a container labeled 2 liters. actual
The cost of gasoline will decrease or stay the same over the next 30 days because of summer holiday travel. What is your alternative hypothesis statement?
a simple random sample of 300 properties is taken from a collection of 9500 properties 3000 of which do not have
a robot that shapes metal needs overhauling if it is out of tolerance on 4.5 of the items processed and it is operating
When one of the five predictor variables in the preceding example is elimi- nated from the analysis, the value of R2 drops from 0.75 to 0.71. What does this tell us about the variable that was dropped?
A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers.
If mean height when these plants are treated with the certain chemical varies from 185. Define the null hypothesis H0 and alternative hypothesis H1 which we would use for this test.
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
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