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A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean score on the questionnaire for these 36 students is 70. The score for a similar class of students who did not see the film is 75. The standard deviation is 12. Using the five steps of hypothesis testing and the 5% significance level (alpha), does showing the film change students' attitudes towards the chronically mentally ill?
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
Find the sample mean and find the sample standard deviation - construct a confidence interval for the true population mean for body temperatures of healthy adults.
Do sit down restuarant franchises and fast food franchises differ significantly in stock price? Specifically, is the average stock price for sit-down restaurants different from the average stock price for fast food restaurants?
Find a 95% confidence interval for the mean daily caloric intake. Interpret this interval.
Show that Pearson's Chi-square statistic for testing Ho : 1 = 2 when there are k-categories reduces to Z^2 when k = 2, where Z = 2 sqrt(n)(p1-1/2) is the standard Z-test for testing Ho : 1 = 1=2
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent..
Why do you think it is significant to describe both the measure of central tendency and the measure of dispersion when talking about a data set?
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine. The data obtained is shown in the table below.
Construct a time series plot. What type of pattern exists in the data? Compute the exponential smoothing forecasts for a = .2.
Set up hypotheses and test to find out whether or not population variance is larger than $100.
Find the third quartile Q3 of the list of 24 sorted values shown below. Which is relatively better: a score of 81 on a psychology test or a score of 50 on a economics test? Scores on the psychology test have a mean of 88 and a standard deviation of..
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