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nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of to . In a recent year, the national mean score for the writing section was , with a standard deviation of . Based on this information, complete the following statements about the distribution of the scores on the writing section for the recent year.
By using the maximax criterion, what decision should be made by the decision maker?
A random sample of 200 people was taken. Sixty percent of the people favor President Obama. The 95% confidence interval for the true population of people who favor Obama is?
In a regression model involving 30 observations, the following estimated regression equation was obtained:
As part of a long-term study of individuals 65 years of age or older, sociologists and physicians at the Wentworth Medical Center in upstate New York conducted a study to investigate the relationship between geographic location and depression.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
For a population with a mean of μ = 50 and a standard deviation of σ = 10, how much error, on average, would you expect between the sample mean (M) and population mean for:
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
A hypothesis states a difference exists between two populations. Sometimes this is an obvious conclusion because the means will be very different.
In a surgey of 280 adults over 50.80%; said they were taking vitamin supplements. Find the margin of error for this survey if we want a 99% confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average $72 a day in tips." Assume the population of daily tips is normally distributed with a standard deviation of $2.45.
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
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