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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.
Build a scatter plot, Find the value of the linear correlation coefficient r, and find the critical value of r using α=0.05. Determine whether there is sufficient evidence to support a claim of a linear correlation between the two variables.
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Epidemiologists are researching the relationship between two levels of tobacco exposure and a positive diagnosis of esophageal cancer. With SPSS, use the data set bd1.sav and the variables tob2 (dichotomized smoking status)
Consider the following estimated regression equation, based on 10 observations.
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The mean output power is 42 watts, with a standard deviation of 8 watts Assuming a confidence level of 95%, which of the following statements do these data support?
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
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An analysis decides to remove records that have missing values-About how many records would you expect would be removed
What is the probability that of today's 1,100 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
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