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We feel that the grade students get on the final exam are related to the amount of studying they do. Analyze the Minitab output to determine the regression equation.
Test at the 5% level of significance whether they are meeting their goal. Select the correct answer out of each pair of choices.
Find the (1) Mean, (2) Median, (3) and the mid-range. Based on the averages, can you conclude that those over 60 years old and over have a higher net worth? Find the standard deviation and variance
To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within plus-or-minus 0.04 of the population proportion, how large a sample size is required?
We say that a suit is unsplit if all 13 cards of that suit are in the same pile. Compute the probability that at least one suit will be unsplit.
what is the probability that the sample has between 15% and 25% of restaurants that have established such policies?
Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes. What is the probability that the sample mean is between 7.8 and 8.2 minutes?
Given a normal distribution with μ = 100 and σ =10, if you select a sample of size 25, what is the probability that x-bar is less than 95
Assume that a random variable, x, is distributed according to a normal distribution with mean. What is the standard error of the estimate, x-bar, if a sample of size 25 is taken?
Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds. What is the probably that a call lasted less than 180 seconds?
Is there a causal relationship between reported and audited sales? If so, what is the independent variable and what is the dependent variable?
The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.
Do these data indicate that the population mean percentage increase in corporate revenue is greater than the population mean percentage increase in CEO salary?
What proportion of accidents involved more than one vehicle? Place your answer, rounded to 2 decimal places, in the blank. For example, 0.23 is a legitimate entry.
A normal distribution has a mean of 80 and a standard deviation of 10. for this distribution, find each of the following probability values?
The distribution of SAT scores is normal with a m=500 and a standard deviation of o=100. What SAT scores (X values) separate. The middle 60% from the rest of the distribution
A consumer survey indicates that the average household spends m=$155 on groceries each week. What proportion of the population spends more than $150 per week on groceries?
A population of scores has m=50 and o=10. If 5 points are added to every score in the population, then the new mean and standard deviation would be?
One of the major measures of the quality of service provided by any organization. What are the null and alternative hypotheses for testing whether the installation supervisor's claim is valid?
Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is greater than the claimed value of 22 minutes?
Compute the p-value for your test. Construct a 99% confidence interval estimate of the population mean amount of paint in a 1-gallon can.
A humane society claims that less than 31% of U.S. households own a dog. Write the claim mathematically and identify Ho and Ha
An anthropologist wants to test whether demographic data can be used to predict the female life expectancy in countries. Can the variables be used to predict female life expectancy in a country?
Determine how many observations actually fall outside the ranges computed in part a). Compare these to the minimum numbers expected by Chebysheff's inequality.
Outliers have a more dramatic effect on smaller data sets. In the data file "Beatles". Generate the box plot and histogram of the sizes of these songs.