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The Johns Hopkins Regional Talent Searches gives the Scholastic Aptitude Test (intended for high school juniors and seniors) to 13-year-olds. In all, 19,883 males and 19,937 females took the tests between 1980 and 1982. The mean scores of males and females on the verbal test are nearly equal, but there is a clear difference between the sexes on the mathematics test. The reason for this difference is not understood. Here are the summary data.
Group sMales 416 87Females 386 74
1. Determine if the male scores are significantly higher than the female scores.
What shape curve do you get when your data set has the mean, median, and mode all with the same value? Could the value of the sample mean and the value of the population mean ever be the same?
The manager of a paint supply store wants to determine whether the mean amount of paint conatined in 1- gallon cans purchased from a nationally known manufacturer is actually 1 gallon.
The probability Mary will receive an A in a class is 0.70. Assuming independence, if she is taking 5 classes this semester, calculate the probability she will receive exactly 3 A's.
Is it sensible to conclude that mean weekly salary of school teachers is lower at .05 level of significance? Explain why?
The Johnson family uses a propane tank for cooking on their gas grill. During the summer they need to replace their tank on average every 30 days.
What is the difference between a z-test and a t-test? When estimating population mean, how would you determine the optimal sample size when the maximum error limit is known
Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
A Gallup Poll (June 9 to 12, 2008) interviewed a random sample of 822 adults (18 years or older). The people in the sample were asked about their level of confidence in a variety of institutions in the United States. Here are the results for small..
Assume we know the length of time a battery will hold a charge is a normal distribution with a mean of 50 hours and a standard deviation of 15 hours.
Laura wanted to build a multiple regression model based on advertising expenditures and Coffee Time's price index. Based on the selection of all normal values, she obtained the following:
What is the expected duration of the game? Given the same CIC, how much more money should Alice have ititially so as to maximize the expected duration of the game?
The lives of many people are affected by a fear that prevents them from flying. The Marist Institute for Public Opinion conducted a poll of 1014 adults
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