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Q1) Educator is interested in researching how teaching methodology (Factor A) and previous experience with type of test (Factor B) might influence scores on particular exam. Levels of Factor A are control (implying no special instruction), group instruction, and private tutoring. Levels of Factor B are no prior experience with test, one prior experience, and two prior experiences. 27 students were available for study. Nine students from each experience level were randomly assigned to teaching conditions. Experiment ran for one month and final test was administered with following results.
Factor B: Experience
Factor A: Teaching Method
Control
Group Instruction
Private Tutor
None
60
71
77
62
75
65
76
79
Once
68
69
82
73
80
84
Twice
70
85
87
90
a) Set up hypotheses and carry out all relevant tests
b) Describe all results and implications which you have discovered.
i) This includes testing for interaction effects.
ii) This also implies testing for differences between means of levels of factors which are determined to be significant
Compute mean x and standard deviation s of data above. Calculate Ho by using traditional/classical method.
The manager is concerned that sales are slipping, after taking into account the average value of sales for four consecutive Saturdays being $4800.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car.
Compute a seasonalized or adjusted sales forecast.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
Consider the following situation describing layoffs at a manufacturing plant of the Monsanto Company. Does there appear to be a case of age discrimination between those laid off and those non-laid off?
Find the mean ______________ and the standard deviation _____________
Make a decision using the p-value approach at the given α = 0.05.
Why can not we just do several two sample tests like we did in the last week. In your own words explain briefly also tell us what these are and what did it mean.
Analysis of data sets assignment
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
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