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The following values of shear strength (in tons per square foot) were determined by unconfined compression tests of soil from Waukell Creek, California. Plot histograms of this data using four, six, and eight intervals. In the second case consider three different locations of the interval division points. With a few extreme points, as here, it may be advantageous to consider unequal intervals, longer in the right-hand tail.
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
If 120 of the faculty and 150 of the students voted in the 2016 Presidential election, is there enough evidence at the 5% level of significance to support the researcher's claim?
What is the probability that there will be at least m pages which contain more than k misprints?
Using the .05 level, what should the researcher conclude? Solve this problem explicitly using all five steps of hypothesis testing.
Several complaints recently have been sent to the Gotham City police department regarding the increasing incidence of congestion on the city's streets.
You've been recently hired as a marketing analyst in an advertising agency. You are assigned the task of assessing the impact of direct marketing promotions.
For safety purposes, the 'maximum capacity' of this elevator is stated as '13 persons, or 1000kilograms'. What is the probability that this group of twelve students exceed the maximum weight capacity of the elevator?
Assume the number of days it takes a homebuilder to complete a house is normally distributed with an average completion time of 176.7 days and a standard deviation of 24.8 days. Calculate the completion time that the builder has a 40% probability ..
In 1997, a survey of 900 households showed that 151 of them use e-mail. Use those sample results to test the claim that more than 15% of households use e-mail. Use a 0.05 significance level. Use this information to answer the following questions?..
Overall, stocks have risen in value during 95 of the 130 years since the market began in 1872. How is this fact relevant in assessing the statistical reasoning of the advisors?
Treat this as though it were a random sample, and test whether there are differences in the proportion of men and the proportion of women who smile.
Suppose that the scores of architects on a particular creativity test are normally distributed.What percentage of architects have Z scores. (a) above .10, (b) below .10
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