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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 (i.e. alpha = .05), does showing the film change students' attitudes towards the chronically mentally ill?
What does it mean to set alpha at .05?
What is your null hypothesis? Alternate hypothesis?
Is this a one-tailed or two-tailed hypothesis?
What is the criterion z?
Suppose the obtained z was -2.5. Do you reject or fail to reject the null hypothesis?
State in words what you have found.
How do I go about solving and then graphing the following system?
At square deals floor covering a popular floor covering sells for $9.00 per square foot . Write a function that gives the price ( P) of a square floo covering that has edge length of (x) feet.
Suppose three fair coins are flipped. Find the probability for each of the following events. Exactly two coins are tails.
If we are conducting a hypothesis test of a single proportion to determine if the proportion of late arrivals has increased: What is the value of the calculated test statistic?
A certain population has a mean of 488 and a standard deviation of 31. Many samples of size 51 are randomly selected and the means calculated.
A bottle company estimated 155,000 on delivery cost alone this year, if the total cost estime is 668,000. what percentage of total sales will be spent on delivery.
Explain how to calculate the derivative of a polynomial function and provide an example to illustrate your explanation.
The base of an aquarium with given volume V=465 is made of slate and the sides are made of glass. If slate costs five times as much (per unit area) as glass, find the dimensions of the aquarium that minimize the cost of the materials. (Enter your ..
Shelley wants to cash in her winning lottery ticket. She can either receive ten, $100,000 semiannual payments starting today, or she can receive a lump-sum payment now based on a 6% annual interest rate. What is the equivalent lump-sum payment?
Write an equation that represents the outside edge of the exercise ring. The equation of the outside edge of the racetrack is . Sketch the outside edge of the racetrack on the graph.
how is doing operations-adding,subtracting, multiplying, and dividing- with rational expressions similiar to or different from doing operations with fractions? Can understanding how to work with one kind of problem help understand how to work anot..
In a shop there are 20 customers, 18 of whom will make a purchase. If three customers are selected, one at a time, at random, what is the probability that all will make a purchase?
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