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You notice in your introductory psychology class that more women tend to sit up front, and more men in the back. To determine wheather this difference is significant, you collect data on the seating preferences for the students in your class. The data follows.
Men Women
Front of the room 15 27
Back of the room 32 19
What is X2obt?
What is Df for this test?
What is X2cv?
What conclusion could be drawn from these results?
They select every 20th person from the list until a sample of 100 is obtained. They then call these 100 people. Does this sampling plan result in a random sample? Simple random sample? Explain.
Suppose that 20% of the population has high blood pressure. If 7 people are randomly selected off the street, what is the probability that more than 4 of them do not have high blood pressure?
According to Chebyshev's Theorem, how many students scored between 23 and 95?
Using a 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
How large a sample should be taken if the desired margin of error E is:
Calculate the z score for a raw score of 10 from the folowing scores:10,20,25,5,30. Based on your anser , approximately what percentile does the raw score of 10 represent?
Why is cohort studies more expensive than case-control studies? I know one problem is cohort studies often must be followed up for a long period to determine whether the outcome of interest has developed and they are more expense than case-control..
Question 1 Which of the following indicates how many observations fall into various categories?
Compute the probability of receiving four calls in a five-minute interval of time. Compute the probability of receiving more than 10 calls in a five-minute interval of time.
Doctors nationally believe that 68% of a certain type of operation are successful. In a particular hospital 47 of these operations were observed and 37 of them were successful. At a = 0.05 is this hospital's success rate different from the nationa..
A class contains 30 students. Ten are female (F) and U.S. citizens (U); 12 are male (M) and U.S. citizens; 6 are female and non-U.S. citizens (N); 2 are male and non U.S. citizens. A name is randomly selected from the class roster and it is female..
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
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