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A random sample of 51 observations was selected from a normally distributed population. The sample mean was xbar = 88.6, and the sample variance was s2 = 38.2. Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance? Use the p-value method.
The manager for Select-a-Seat, a company that sells tickets to athletic games, concerts, and other events, has determined that the number of people arriving at the Broadway location on a typical day is Poisson distributed with a mean of 12 per hou..
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
A federal bank examiner is interest in estimating the mean outstanding defaulted loans balance of all defaulted loans over the last three years. Calculate a 90% confidence interval for the mean balance of defaulted loans over the past three years.
Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has margin of error less than 1%. Roughly how large a sample w..
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes.
National average for 2-year leases is 30,000 miles. Select the suitable hypothesis.
nterpret the meaning of the y-intercept, b(0), and the slope, b(1), in this problem. Use the prediction line developed in (a) to predict the GPA for a student a GMAT score of 600
Using an appropriate statistical test determine if there is a significant association between gender and satisfaction with the new initiative.
The number of traffic accidents that occurs on particular stretch roas during a month follows a Poisson distribution with mean of 8.5. Find the probability of observing exactly three accidents of this stretch of road next month.
When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population proportions.
Tim has two more problems to solve on his test, but he doesn't know how long it will take to finish them. He assigns mutually irrelevant normal distributions to the times
In a two-way ANOVA, there are 4 levels for factor A, 5 levels for factor B, and 3 observations for each combination of factor A and factor B levels. The number of treatments in this experiment equals:
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