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a.) The grades of class are A 10%, B 20%, C 40%, D 20% and F 10%. A.) if we assume that the grades are normally distributed, how many standard deviations on either side of the mean will consist C grades?
b.) Suppose that distribution of grades has average of 78 with standard deviation of 11. Find the appropriate cutoff points for the grades A and F.
Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance?
A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent..
With each hypothesis, indicate whether the appropriate analysis would be a one-tailed test or a two-tailed test and indicate a type I and type II error, given the context of the hypothesis.
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sampl..
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate u and standard deviation in the formula for the normal approximation to the binomial
A sales person at a company sold 6,903,435 of hardware equipment last year, a figure that represented the eighth decile of sales performance at the company. What can you conclude about the salesperson performance?
What is the difference between common causes of variation and special causes of variation?
Why do you use the chi-square statistic? Explain. What type of data is used with chi square analysis? Explain. What are the hypotheses in a chi-square test for independence? Explain.
The Atlanta Convention & Visitors Bureau just released a report on the percentage of available hotel rooms in Fulton County that were rented (occupied) in 2003.
Compute a 95% confidence level for the difference in the means of the two treatment methods and select the best answer below. Assume that the independent random samples were taken from normal distribution.
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
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