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The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
Twenty three percent of automobiles are not covered by insurance. On a particular weekend, 35 automobiles are involved in accident.
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
Use alpha level. 05 to compute and interpret Pearson's r and to test whether it is important (using all your steps for hypothesis test).
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
How do question content and wording, response strategy, and preliminary analysis planning affect question construction?
Suppose 10 balls, numbered 1-10, are to be distributed randomly into 10 boxes. a) What is the probability all 10 balls are placed into one box? b) What is the probability that no boxes are empty?
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
Write down the differential equations which describe the probabilistic behavior of the unit in time as a Markov process.
The mean of a normal probability distribution is 60; the standard deviation is 5.
You run a two tail t-test. The critical value for this test at the .05 level is a t of 7.82. What value must the obtained t-test statistic be in order to be considered significant at the .05 level?
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