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A poll of 69 students found that 30% were in favor of raising tution to build a new math building. The standard deviation of this poll is 6%. What would be the standard deviation if the sample size
A raffle has grand prize of European cruise valued at $13000 with a second prize of a weekend in San Diego valued at $600. If each ticket costs $5 and 10400 tickets are sold, what are the expected w
An insurance investigator has observed people with some astrological signs tend to be safer drivers people with other signs. Using insurance records, the investigator classified 200 people according
The data below are from an independent-measures experiment comparing three different treatment conditions.
Choose the regression line equation that could belong to a data set that has a sample correlation coefficient of r = 0.682. Find a 90% confidence interval for your prediction
What happens to the critical value for a chi-square test if the size of the sample is increased?
A set of n = 5 pairs of X and Y values has SSX = 4, SSY = 16 and SP = 8. For these data, what is the Pearson correlation?
A researcher obtained the correlation of r = -0.72 between the amount of time spent watching television as well as grade point average for college students. This means that there is general tendency
A set of X and Y scores has SSX = 10, SSY = 20, and SP = 8. What is the slope for the regression equation?
Choose the regression line equation that could belong to a data set that has a sample correlation coefficient of r = 0.682
For an independent-measures ANOVA comparing 3 treatments with sample of n = 5 in each treatment, determine the critical value for the F-ratio using a = .05?
The mid-distance running coach, Zdravko Popovich, for Olympic team of eastern European country claims that his six-month training program significantly decrease the average time to complete a 1500-m
The standard deviation of sample was 0.9 hours. Is it reasonable to conclude that students at West Virginia sleep less than typical American? Compute the p-value.
If these data were used for a chi-square test for independence, what is the expected frequency for registered females?
A researcher chooses a sample of 100 people to determine the relationship between gender (male/female) and registering to vote. The sample consists of 40 females, of whom 30 are registered voters, a
Which of following accurately explains the chi-square test for goodness of fit?
Which of the following is a characteristic of a correlational study?
For an independent-measures two-factor experiment, the bigger the differences between the sample means, the more likely it is that at least one of the F-ratios will be significant. True or False?
The yield of chemical procedure is being studied. The past five days of plant operation have resulted in following percent yields: 91.6, 88.75, 90.8, 89.95, and 91.3. Determine the point estimate of
Consider the normal distribution curve where middle 15 % of area under the curve lies above the interval ( 6 , 14 ). Employ this information to find out the mean, mu , and the standard deviation, si
A sample from the population with m = 40 and s = 10 has the mean of M = 44. If the sample mean corresponds to z = 2.00, then how many scores are in sample?
Assume admission to summer basketball camp needs that the camp participant should be in the top 10 % of men's heights, determine the minimum height that a camp participant can have in order to meet
The mean value of land as well as buildings per acre from sample of farms is $2400, with a standard deviation of $450. (Assume the data set has a bell-shaped distribution.)
Principal of high school concerned regarding the amount of time students work. He wishes to determine the mean number of hours worked per week for such students. From earlier study, the known standa
What are the differences between probability distribution functions and probability density functions? Why do we care?