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Question:
The monthly average sales of the Smiling Ninja Computer Company may be approximated to a normal distribution curve. It has a mean of $22,000 and a standard deviation of $3,300.
Drawing a curve for each question, calculate the proportions of the following:
a. The proportion of sales greater than $21,500 per month;b. The proportion of sales less than $21,000 per month;c. The proportion of sales between $22,500 and $24,500.
Note: Show all relevant workings and draw a normal distribution graph for each part.
What is the probability that the drug will be effective for 2 hours or less?
Later, we"ll discuss a method called "backward" elimination for determining which variables to include in your final model. What about the coefficients?
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Find out the forecast value utilizing three month moving average method, weighted moving average method, exponential smoothing and regression methods.
The general social survey is an annual survey given to about 1,500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe the respondents' views of employment.
How should he go about taking samples to gather data for testing the hypotheses?
Give an example of a problem (business, political, scientific) in which ANOVA analysis would be appropriate. (Hint: the dependent variable is categorical, such as male vs. female or comparing three different types of fertilizer.)
The lowess fitted value is 0.883. Thus the value of adj discussed on the previous slide is 0.883 for spots with A=7. How is the lowess curve determined?
Your office has just received 140 insurance claims to be processed in the next few days. Find the following probabilities.
What can we say about the form or way of the distribution of the average or median of the sample?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
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