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A sample of 93 golfers showed that their average score on a particular golf course was 89.33 with a standard deviation of 6.43.
Answer each of the following (show all work and state the final answer to at least two decimal places.):
(A) Find the 95% confidence interval of the mean score for all 93 golfers.
(B) Find the 95% confidence interval of the mean score for all golfers if this is a sample of 110 golfers instead of a sample of 93.
(C) Which confidence interval is smaller and why?
A random sample of 225 fathers from Littleton, yielded 97 who did not help with child care. Using a .05 level of significance test the claim that the proportion is at least 34%.
We can compare two sample means to determine if the samples were obtained from normal populations with the same mean using the "t" distribution.
Bags of tea are sampled to ensure proper weight. The overall average for samples is 8 ounces. Each sample contains 10 bags. The average range is 0.1 ounces.
The sampling plan is perhaps the single most important aspect of generalizing research findings beyond the study sample. In a quantitative research study, what method of sampling allows for the greater generalization of findings?
Twenty subscribers were surveyed, it found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979.00. The standard deviation of the sample was $1000.00.
What is the predicted values of the fund in the period t = 1? What is the predicted value of the fund in the period 3, and period 7?
Describe why the normal distribution can be used as an approximation to binomial distribution. What conditions should be met to use the normal distribution to approximate the binomial distribution? Why is a correction for continuity essential.
Based on the information provided, which set of variables provided the best predictor of the spring fox population?
Formulate a linear programming model for this problem (using QM on Windows and/or Excel on Windows)
Assume that ages at onset of this disease are normally distributed for each gender, do not assume the population variances are equal. What are the appropriate null and alternative hypotheses?
A sample of 64 Atlanta consumers showed a mean quarterly water bill of $51 with a sample standard deviation of $12. At α = .05, does the Atlanta sample support the conclusion that above-average rates exist for this private water system?
The Appliance Center sells a variety of electronics equipments and home appliances. For last four years the following quarterly sales (in $ millions) were recorded.
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