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Confidence Intervals for Population Proportions
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 =
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
Describe each of the following methods of statistical inference in detail (Please try to use layman's terms).
There are 5,000,000 Adults 25+ in Mtown. An advertiser buys a schedule on Channel 45: 20 spots in early news with an average A25+ quarter hour audience of 150,000, 25 spots in daytime with an average A25+ quarter hour audience of 200,000, and 10 s..
A local university administers a comprehensive examination to the recipients of a B.S. degree in Business Administration. A sample of 5 examinations are selected at random and scored. The test scores are 56, 85, 65, 86, and 93. At 98% confidence, ..
Stores A, B, and C, have 50, 75, and 100 employees and respectively 50%, 60%, and 70% if these employees are women. Resignations are equally likely among all employees regardless of sex. One employee resigns and she is a woman. What is the probabi..
To estimate the true proportion of students who abstain from alcohol at LBCC, you will need to take a simple random sample.
Develop a joint probability table for these data and use the table to answer the remaining questions. What do the marginal probabilities tell you about the age of the US population?
If Stephenson wishes to maximize its total market value, would you recommend that it issue debt or equity to finance the land purchase? Explain.
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
Determine the probability of fatal accident over lifetime? Describe your reasoning carefully. Suppose independent events. Why might the supposition of independence be violated?
Develop percent frequency distribution and construct bar chart and pie chart.
Identify the scale of measurement in each of the following:
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