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In a speech to the Chamber of Commerce, a city councilman claims that in his city less than 15% of the adult male population is unemployed. A subsequent check taken by a newspaper reporter showed that among 300 adult males polled, 36 were unemployed. Is there sufficient evidence to support the councilman's claim at a level of significance of .05?
4 clothing manufacturer tests SRS of 5 specimens of each fabric. Determine the probability that mean breaking strength of 5 untreated specimens exceeds 50 pounds?
A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confident that the sample mean is correct to within plus-or-minus $50 of the population mean.
Using 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product.
Construct a scatterplot and identify the mathematical model that best fits the given data. Assume that the model is to be used only for the scope of the given gata, and consider only linear, polynomial (degree 2) logarithmic, exponential, and powe..
What id Steve's grade point average at graduation and what is Steve's median grade point at graduation
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
Why are samples studied when we want to know about populations? Why are random samples used instead of just any sample? How would you determine an appropriate sample size?
Following a lognormal distribution with a mean of 3000 rpm and std deviation of 0.87, what if the boss want a 5% chance of HW failure before selling, how often would I have to replace this hardware ?
If the sales are $150,000 per month, determine how much the company can expect to receive of this amount.
A seed distributor claims that 80% of its beet seeds will germinate. How many seeds must be tested for germination in order to estimate p, the true proportion that will germinate, so that the maximum error of the estimate is " = 0:03 with 90% con ..
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