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Suppose you conduct survey asking people if they support something or if they like some product or if they watch some TV-show.
Assign your numbers for
- total number of people who participated in the survey (sample size),
- numbers of people who answered "yes" to the given question.
Calculate sample proportion and then calculate Margin of Error for Population Proportion and write down confidence interval for population proportion.
Apply confidence level 95% (z c = 1.960).
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
What is the probability that no more than two of the three are commercial successes?
What is the null hypothesis in a chi-squared test of independence? How many 'tails' can a chi-squared test have, one or two? In a regression analysis, what do the residuals from the fitted line add up to?
An experiment ws designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were littermates.
The personnel manager at a company wants to investigate job satisfaction among the female employees. One evening after a meeting, she talks to all 30 female employees who attended the meeting.
Find the standard deviation and variance from the (population) data below. Describe your results.
A normal distribution has a mean of µ = 100 with σ = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 90 and X = 120?
In checking the quality of the work, she notices that some slight blemishes occasionally are apparent. A sample of 20 pieces of work resulted in the following number of blemishes on each piece:
List one unclear concept regarding regression and provide an example from your personal or work life where regression could be used to show a relationship between two variables.
In determining automobile mileage ratings, it was found that the mpg in the city (x) for a certain model is normally distributed, with a mean of 24 mpg and a standard deviation of 1.0 mpg. Find the following:
Assume Nick doesn't know how his received he suppose that all three states of nature are equally likely to occur. If Nick uses the equally likely criterion illustrate what decision would he make.
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