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The Problem Solving Inventory (PSI) has a normal distribution with mean = 90 and standard deviation = 15. A researcher suspects that the mean for female students is higher than 90. She takes an SRS of 25 female students and gives PSI. Suppose we know that scores in the population of female students are normally distributed with standard deviation = 15.
(a) State the null and alternative hypotheses for the study of female students. (1 pt)
(b) Suppose that the sample mean of 25 students is 91.5. What would be the test statistic Z?
The regression line yˆ2 = 3 + 2x has been fitted to the data points (4,8), (2,5), and (1,2). The residual sum of squares will be:
To test the effectiveness of a new type of plastic handcuffs, a law enforcement agency puts the cuffs on a sample of 30 persons who belong to the local weightlifting club. None is capable to break free from the cuffs. What type of sampling techniq..
Determine the margin of error that corresponds to the given values of n (times) and x (successes) and the degree of confidence: n=1400, x=420, 95%. Go 3 decimal places of precision.
Paired samples t-test for the given data - financial advice from the voluntary organization - A local voluntary organization affiliated to the Citizens Advice Bureau offers free financial advice to residents in the area who are registered debtors
When using the F-statistic for hypothesis testing of the variance, which sample variance is the numerator and which sample variance is the denominator?
The following data are the lifetimes (in hours) of 20 certain electrical components: Find a point estimate and 90% confidence interval for the population lower quartile.
The total population of car passengers involved in traffic accidents are classified into six categories: two factors (one with 2 levels and one with 3 levels) crossed.
Toby's trucking company determined that the distance traveled per truck per year is normally distrinuted, with a mean of 50.0 thousand miles and a standard deviation of 12.0 thousand miles.
Country A and Country C spends about the same amount on average per person per year. Which has the greater spread?
A shoe salesman want to see if his female customers have a preference in the color of shoe purchased. What is the test value for the following data?
Tourism is one consideration for Coffee Time's future. A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small café during their visit.
A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal?
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