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Is there evidence of a relationship between gender and whether a student is a vegetarian, non-vegetarian, or sometimesvegetarian?
a. Use software to access the student survey data, and carry out a chi-square test for a relationship between the two variables; report the chi-square statistic and the P-value.
b. State whether or not there is statistical evidence of a relationship.
The normal distribution is a theoretical distribution in which scores are symmetrically distributed above and below the mean, the median.
Explain the difference between a left-tailed, two-tailed, and right-tailed test. When would we choose a two-tailed test? How can we tell the direction of the test by looking at a pair of hypothesis?
Calculate measures of central tendency for both listing prices and square footages. Those measures are mean, median, and mode. Determine the quartiles for both listing prices and square footages.
When are you allowed to perform a one-sided test? What should you do if you are not sure if it is allowed?
Expected Commercial Value Forcast
Examine the residual files and produce appropriate residual plots to examine the assumptions. Are the Level-1 residuals normally distributed? Are the level-2 residuals multivariate normal? How do you know?
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.
suppose the sample size from the normal population is 11. also assume that the population standard deviation is
Prediction equation is y^ = 30 + 0:60x. Determine predicted final exam score for student who has (i) midterm score = 100, (ii) midterm score = 50. Note that predicted nal exam score regresses toward mean.
One group is given the new drug and the other group is given the standard drug. Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
Assuming that the food expenditure of the households of an entire city of 400,000 will have a bell-shaped distribution, how many households of this city would you expect to fall in each of the intervals, x ± s, x ± 2s, and x ± 3s?
A data set of 32 stream sections includes the following variables: X1 is the depth of flow; X2 is the roughness of the channel bottom.
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