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A Bright Idea. A company produces lightbulbs whose life follows the N(1500; 300) distribution, i.e. the lifetimes of lightbulbs have a normal distribution with a mean of 1500 hours and a standard deviation of 300 hours. Use this information to answer the following questions. (a) Find the probability that a lightbulb burns out before 1050 hours of use. (b) Find the proportion of lightbulbs that will last longer than 1650 hours (c) What is the probability that a bulb's lifetime will be between 1140 and 1620 hours? (d) Only 5% of the bulbs last longer than how many hours? (e) The middle 50% of bulbs last between how many hours?
1.the st. paul pioneer press has assigned its one remaining reporter to write an article about gasoline prices in the
A professor want to know how students feel about gun control, so he surveys his students asking %60Are you in favor or opposed to gun control.%60 All of his students respond. What is the major source of possible bias in this study?
Make sure you include a complete ANOVA summary table. Also, report the appropriate null and research hypotheses and the critical value (alpha = 0.05).
If a lot is known to contain 10% defective items, find out the probability that lot will be rejected? Accepted?
A library checks out an average of 250 books per day, with a standard deviation of 75 books. If a sample of 36 days of operation is selected and the sample mean is computed,
q1. a survey was conducted in five countries.the percentages of respondents who said that they eat out once a week or
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
A student team in a business statistics course performed a factorial experiment to investigate the time required for pain-relief tablets to dissolver in a glass of water.
If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part
Describe ways in which the use of MS Excel as a tool for interpreting data can be used by a manager of an organization.
The heights of all female college basketball players produce a distribution
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