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1. The ranking of the top 5 scoring players on the team
We are interested in knowing whether the average Colts player is taller than the average Bengals player. We attempt to answer this question by calculating the average height of the Colts offensive line and comparing it to the average height of the Bengals offensive line.
2. Are the averages in these example parameters or statistics (explain why)
3. Would the method described above be a good way to determine which team was taller (explain why or why not)?
4. In control charts, what is the difference between an I-chart and an X-bar chart?
5. Can you use an X-bar chart with non-normal data?
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
Create a 90% confidence interval for proportion of all kernels that would not pop.
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
Find out the mean sum of squares of the treatment in one way ANOVA.The profits of individual traders in three departments, labelled by A, B and C, in a medium sized firm were recorded on one day.
Find out the p-value associated with test of hypothesis you conducted?
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
Enter data into SPSS (use two columns: one for coding {0, 1, 2, 3, 4, 5} and one for DV)
Organize data into a frequency distribution. How many classes would you propose? What value would you propose for class interval?
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
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