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Freddie is a tennis player who is working on his first serve. While practicing, he gets 12 out of 20 of his first serves in. Freddie wants to know if his long-run proportion of getting his first serve in is greater than 50%.
a. What is the value of the statistic? use the appropriate symbol in your answer.
b. Suppose you find that the mean is .5, and the SD = .125 calculate the standardized statistic showing your set up.
c. Discuss in context what your conclusion would be to Freddie's question based on the standardized score, and explain why you make that conclusion.
d. Suppose you want to use the One Proportion applet to generate 100 simulated samples. What do you put in for each of the following: Probability of heads? Number of tosses? Number of repetitions?
e. Suppose when you run the applet, you get the results shown. Interpret the p value in the context of this problem.
The personnel department keeps records on all employees in a company. Here is the information that they keep in one of their data files:
State the four steps of hypothesis testing. What are two decisions that a researcher makes in hypothesis testing?
Using a 1% level of significance, can we say that there is a difference in the average waiting time between the two shops? Find the critical value(s).
A baseball manager is looking to examine the distribution of batting averages for his team to see if they are performing up to expectations as a team.
A group of 200 adults aged 21 to 50 were selected from those entering Fit Right Health stores in Washington State, and were randomly divided into two groups. One group was given a herb and the other a placebo. After 6 months, the number of respira..
The results of the ANOVA carried out were summarized as F(2, 101) = 3.61. Analyze this result and state a conclusion about this study.
(a) What is the probability that he will answer all questions correctly? (b) What is the probability that he will answer all questions incorrectly?
The math quiz scores show that µ=75 and s=10. What quiz score is three standard deviations below the mean?
one person has 3 dollars to gamble each time he uses only one dollar the probability is 60 to lose and 40 to win. if he
Normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task times qualify individuals for such training?
In a few sentences, describe why this recordkeeping would be important.
An epidemiologist is trying to discover the cause of a certain kind of cancer. He studies a group of 10,000 people for five years, measuring 48 different "factors" involving eating habits, drinking habits, smoking, exercise, and so on.
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