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Construct a 90% confidence interval estimate for the proportion of current spring students who will return for summer school.
60 people liked the cereal, 40 people did not like the cereal. Construct a 95% confidence interval for the proportion of all consumers who will like the cereal.
The cost of weddings in the united States has skyrocketed in the recent years. At the .05 significance level is it reasonable to conclude the mean wedding cost is less than $ 10,000 as advertised?
For a recent year, the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington. At the .01 significabce level, can we conclude that the mean fare has increased ? What is the p-value ?
At the .05 level of significance, can we conclude that the mean number of interviews conducted by the agents is more than 53 per week? Estimate the 9-value.
The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before loses its effectiveness. At the .025 level, has Holdlonger increase the self life of the chlorine?
A randon sample of six resulted in the following values: 118, 105, 112, 119, 105, and 111. Assume a normal population. What is your decision regarding the null hypothesis.
Utilize at least one of your predictor variable and briefly describe the article. Finally, discuss how well (or not) the variable predicted each social problem.
Compute the 98 percent confidence interval for his mpg. How many times should he fill his gas tank to obtain a margin of error below 0.2 mpg?
Construct the 95 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank.
Find a peer-reviewed article that reflects these circumstances, describe the research conducted (i.e., ANOVA) and discuss the results.
A random sample of 25 observations was taken from a normally distributed population. The average in the sample was 84.6 with a variance of 400. Construct a 90% confidence interval for m.
If the standard deviation of the lifetimes of vacuum cleaners is estimated to be 300 hours, how large of a sample must be taken in order to be 97% confident that the margin of error will not exceed
A researcher is interested in determining the average number of years employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample shoul
Assuming π = 0.50, specify the probabilities for the possible values for Y, and find the distribution's mean and standard deviation.
A university planner wants to determine the proportion of spring semester students who will attend summer school. She surveys 32 current students discovering that 12 will return for summer school. W
A health club annually surveys its members. Last year, 33% of the members said they use the treadmill at least 4 times a week. How large of sample should be taken this year to estimate the percentag
Suppose that we know that the study time follows a normal distribution with standard deviation = 65 minutes of the population of all first year students at this university.
Determine whether the variable X has a binomial distribution in each of the following cases. If it does, explain why and determine the values of the parameters n and p. If it doesn't, explain why no
A random variable U is sampled from the U[0, 1] distribution, with consecutive samplings being independent. find the distribution of X, and then calculate its mean and variance.
The maze and the time necessary to exit the maze is recorded for each. What is the probability that the sample mean differs from the population mean by more than 3?
Based on these results, a confidence interval for the population mean is found to be μ = 5.7 ± 4.4. Find the degree of confidence.
The objective is to determine the optimal placement of ads by PMA in the newspaper during August so as to maximize the cumulative total exposure.
the mean is $3.79 the standard deviation is $0.18 and the random sample is 40 what is the standard error of the mean.
Suppose that the distribution of salaries is normal with a standard deviation of $7500. What is the probability that a randomly selected teacher makes less than $52,000 per year?