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The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 64 lasted more than 1000 hours. Find the point estimate for the population proportion, the margin of error for a 95% confidence interval and then construct to the 95% confidence interval for the population proportion a. Find the margin of error E.b. Construct a 95% confidence interval for the population proportion p of all Twinkle bulbs.
Normal distribution with a mean of 8.1 minutes and a standard deviation of 1.9 minutes. For a randomly received emergency call, find the following probabilities. The response time is between 5 and 10 minutes
What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table.
What is the probability that a cereal would be high calorie, given that it is high fiber? In other words, what is P (high calorie, given high fiber)?
Do these data provide sufficient evidence to indicate that the mean for the population is less than 8 hours? assume a normally distributed population.
A quality engineer in a light bulb manufacturing factory is planning a study to estimate the average life of a large shipment of light bulbs.
How much time and energy do you invest in making sure you aren't guilty of the fundamental attribution error or the self-serving bias?
The New York Times recently reported that 60% of college entrants into elite public and private colleges in the U.S. have parents that earn over $150,000/yr.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this right interpretation for margin of error?
The January 17, 1994 issue of Time magazine reported that 58% of adult Americans said yes to the question "If you or your spouse were pregnant, would you want the unborn child tested for genetic defects?"
In random samples of 12 from each of two normal populations, we found the following statistics: Describe what happens when the sample standard deviations get larger.
Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
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