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The heights of children 2 years old are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches. Pediatricians regularly measure the heights of toddlers to determine whether there is a problem. There may be a problem when a child is in the top or bottom 5% of heights. Determine the heights of 2 year old children that could be a problem.
Compute the value of the proportion of the population.
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49.
Investment A has an expected return of $25 million and Investment B has an expected return of $5 million. Market risk analysts believe the standard deviation of the return from A is $10 million
A probability value of .25 means that an event will occur:
Marentette and El-Masri (2011) used logistic regression to identify predictors of obtaining seasonal influenza vaccination among hospital-based nurses in Canada. Their results are shown in table 1:
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
Standardize the value according to the given average and SD - unstandardize the value according to the given average and SD
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
Estimate and interpret the p-value of the calculated test statistic.
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
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