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A sample of 140 golfers showed that their average score on a particular golf course was 93.38 with a standard deviation of 4.36.Answer each of the following (show all work and state the final answer to at least two decimal places.):
A) Find the 90% confidence interval of the mean score for all 140 golfers.
B) Find the 90% confidence interval of the mean score for all golfers if this is a sample of 95 golfers instead of a sample of 140.
C) Which confidence interval is smaller and why?
Chi-square tests are great to show if distributions differ or if two variables interact in producing outcomes. What are some examples of variables that you might want to check using the chi-square tests? What would these results tell you?
A market research company surveyed consumers to determine their ranked preferences of energy drinks among the brands Monster, Red Bull, and Rockstar.
What are the assumptions regarding an ANOVA test and what Excel aid would you use to perform the test, Data Analysis or MacDoIt? What are the assumptions regarding a Chi-square test?
The amounts dispensed by a cola machine follow the normal distribution with a mean of 7 ounces and a standard deviation of 0.10 ounces per cup.
If x is a binomial random variable where n=100 and p=.1, find the probability that x is less than or equal to 11 using the normal approximation to the binomial.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
Suppose that the incident rate of a particulat kind of accient is 1/10,000 persons. In a town of 50,000 persons, what is the probability that there is no accident of this kind?
Critically illustrate out the term standard deviation. Define mathematical averages. Why is the standard deviation less than the mathematical average?
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
Using WSJ or IBD look up the following stocks: General Electric, General Motors, Microsoft and Intel and answer the following questions for each stock. You may have to refer to several issues of your newspaper for all of the information if the pap..
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
Describe each of the following methods of statistical inference in detail (Please try to use layman's terms).
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