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Conduct Chi Square Tests of Significance for the following analysis conducted by a counselor to determine help-seeking behavior across gender and social class of the clients in his clinic. Use the five-step model of hypothesis testing for each analysis.
Help-Seeking Behavior Lower Class Working Class Middle Class Upper Class
Often or Always 7 161 241 24
Sometimes 28 340 301 20
Never 34 138 112 4
Explain thoroughly, the concept of standard deviation. How does range affect standard deviation? What is a z-score, and how do z-scores relate to the mean of a set of data?
How large a sample should be taken if the desired margin of error E is:
What is the probability that the device will detect at least one of the two shoppers entering together?
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. a) what is the area between 415 pounds and the mean of 400 pounds?
In what sense is this business problem? A societal problem? An individual problem?
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
A much larger sample would be needed to estimate the proportion of the U.S. Army's 2.4 million active duty and reserve personnel who approved the repeal than would be needed to estimate the proportion of the Marine Corp's 200,000 personnel who fel..
Lab technicians at a major mdical lab can process an average of 400 blood samples a day with a standard deviation of 50 samples. The processing follows a normal distribution.
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