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Suppose a researcher is testing a null hypothesis that mean(or weird shaped u)= 61. a random sample of n=36 is taken resulting in a sample mean of 63 and s=9. conduct the appropriate hypothesis test and make a decision.
If the mean number of small business failures per month is 10, what is the probability that exactly four small businesses will fail during a given month?
In the following questions, you should demonstrate your understanding of sampling distribution:
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
The hypothesis that the samples came from identical populations cannot be rejected, the T value is 16.5 greater that the lower limit.
A sample of 81 observations is selected from a normal population with a standard deviation of 5. The sample mean is 40. Determine the 95% confidence interval for the population mean.
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
Test scores on a university admissions test are normally distributed, with a mean of 500 and a standard deviation of 100. a) What is the probability that a randomly selected applicant scores between 425 and 575?
Find the probability of exactly 6 Mexican-Americans among 12 jurors.
Let p represent the population proportion of all numbers in the corporate file that have a first nonzero digit of 1. Test the claim that p is less than 0.301 by using What is the value of the test statistic?
The average public elementary school has 450 students. assume the stand deviation of the distribution is 99. if a random sample of 36 public elementary schools is selected, find the probability that the number of students enrolled is between 445 a..
Given the consumer is 18 to 24 years old, what is the probability that the consumer uses a plastic card? Given the consumer is over 24 years old, what is the probability that the consumer uses a plastic card?
What is an independent sample? What is a related sample? When should researchers use different hypothesis tests for independent and related samples?
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