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The National Institute on Alcohol Abuse and Alcoholism recently reported that of 100 eighth graders recently sampled, 41 of them had used alcohol.
The winning team's scores in 9 high school basketball games were recorded. If the sample mean is 9.8 points and the sample standard deviation is 0.15 points, find the 98% confidence interval of the
Construct a 90% confidence interval estimate for the expected Revenue when Employees = 32000. Provide a verbal interpretation of this value.
The prices recorded were $1.36, $1.37, $1.38, $1.39, and $1.40. What is the range, mean price, and the standard deviation of the gasoline?
She randomly selected 9 students. Their average age was 19.1 years with a standard deviation of 1.5 years. What is the 95% confidence interval for the population mean?
Third quartile = 107 Midrange = 93 Range = 56 Standard deviation = 12 For how many of the 100 days was the number of paying customers within three standard deviations of the mean ? Explain how yo
the solution of A batch of 25 containers for frozen orange juice contains 5 that are defective. Three are selected, at random, without replacement from the batch. What is the probability that the th
Construct a 95% confidence interval for the population variance. Test at the 5% level of significance that whether the variance of length of pipes is significantly different from the standards.
A survey shows that distribution of the annual salaries of high school teacher in a certain school district is approximately bell-shaped with a mean of $45, 000 and a standard deviation of $3, 500.
Suppose that three random variables x1,X2,X3 form a random sample from a distribution for which the mean value is 5. Determine the value of E(2X1 -3X2 +X3 -4).
In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of 6 students were given the exam before and after taking the course.
an election poll reported that a candidate had an approval rating of 34% with a margin of error E of 2%. Construct a confidence interval for the proportion of adults who approve of the candidate.
Over the years, there has been a rapid rise of fees and expenses charged by mutual funds. What is the sampling distribution of the test statistic if the null hypothesis is true?
The mean weight of loads of rock is 46.0 tons with a standard deviation of 8.0 tons. If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is
Note there are no symbols used in stating a Chi Square type hypothesis - only words.
A random sample of n = 4 scores is obtained from a normal population with mean = 20 and standard deviation = 4. What is the probability of obtaining a mean greater than 22 for this sample?
Are the assumptions satisfied to test the hypothesis? (d) What is the sampling distribution of the test statistic if the null hypothesis is true?
Illustrate your answer with a histogram of the sample's scores and sketches of the population distribution and the distribution of meansdistribution and the distribution of means, showing the t scor
Why does the DOT have the same driver at the wheel for the entire test? (d) Do the data meet the conditions necessary for a t-interval for the mean stopping distance?
A normal distribution has a mean of mean = 500 and standard deviation = 100. What score is needed to place in the top 20% of the distribution?
What is the relationship between sales and the amount spent on advertising? The owner collected data for the past year by month. The data is in millions of dollars.
Determine the regression equation. Use assets as the independent variable.