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Consider the following data:
a. Construct a 95% confidence interval for the difference between the population means. Assume the population variances are unknown but equal.
b. Specify the competing hypotheses in order to determine whether or not the population means differ.
c. Using the confidence interval from part a, can you reject the null hypothesis? Explain.
a particular fast food restaurant is located near a university. 50 of the customers are students. students prefer the
For the following population of N=10 scores 14,6,8,3,9,12,1,6. Draw the histogram showing population distribution. Locate value of population mean in your sketch and make estimate of standard deviation.
Doug has defined the event "It will rain" like this: Today, it will either rain or it will not, but not both. He calls the weather service and they say.
describe the characteristics of the f distribution. provide examples.what are we testing when we test for two
Suppose 37% of a company's computer keyboards are manufactured in Los Angeles, and 63% in Detroit. Suppose 2% of the keyboards made in Los Angeles.
let x have an exponential distribution with mean sigma.a find the first quartile q1b how far is the first quartile
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
Which measure of central tendency would you use to summarize the data below? Which inferential test would you use to determine if there is a difference in rainfall between the sample 2 and 3?
Class attendance explained 16% of the variation in grade index among the students. What is the numerical value of the correlation between percent of classes attended and grade index?
Suppose that you have an estimator with a relatively large bias. The estimator is consistent and efficient.- If you had a generous budget for your sampling survey, would you use this estimator? Explain.
The Nile Superstore is conducting a survey of consumer preferences for a new wireless, e-book reader. A sample of 160 people reveals that 120 would buy the new reader. Estimate the value of the population proportion.
Ram buys I kg. oranges from each of the four places at the rate of 2kg 4kg., 5kg., 8 kg., per rupee respectively. Find out how many oranges per rupee he purchased on an average?
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