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The data given shows daily sales at the petrol station. Compute Karl Pearson's co -efficient of skewness.
Quantity sold (in litres) No. of days700 - 1000 121000 - 1300 181300 - 1600 201600 - 1900 251900 - 2200 182200 - 2500 52500 - 2800 2
A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence interval for the true proportion of women shoppers who shop on impulse?
State the alternative hypothesis in statistical terms. Define the critical region by drawing the distribution and labeling the z-critical value.
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
With a Rejection Region of 8, 9 or 10, what is the probability of a Type II error, if the job applicant has a probability of identifying the odd sample with p = 0.5?
A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small buisnesses.
Two percent of the parts from a production process are defective. A sample of five parts from the production process is selected. What is the probability that the sample contains exactly two defective parts?
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? (That is, does the average cycle length under these conditions differ significantly from 24 hours?)
What is the probability that the person thinks that "Made in America" ads boost sales and uses social media online?
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
First, describe in your own words (no direct quotes, please) what a dummy variable is and its purpose in regression analysis. Secondly, provide an example of where you might use a dummy variable from your own professional experience.
An insurance company states that 90% of its claims are settled within 5 weeks. A consumer group selected a random sample of 100 of the company's claims and found 75 of the claims were settled within 5 weeks.
Whirltag claims that the useful lifetime of its dishwashers is normally distributed with a mean of 3 years and a standard deviation 1 year.
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