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The credit department of Lion's Department Store in Anaheim, California, reported that 30 percent of their sales are cash or check, 30 percent are paid with a credit card and 40 percent with a debit card. Twenty percent of the cash or check purchases, 90 percent of the credit card purchases, and 60 percent of the debit card purchases are for more than $50. Ms. Tina Stevens just purchased a new dress that cost $120. What is the probability that she paid cash or check?
If you have a population that has a small sample, but does not meet all of the criteria for the nonparametric test how can you tell what test to use?
You are the manager of a fast food restaurant. You want to determine whether the population mean waiting time to place an order has changed in the past month from its previous population mean value of 4.5 minutes.
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
Seventy-five percent of households say they woud feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings.
In a simple linear regression analysis of 18 data points the following ANOVA table was found.
A quality control engineer wanted to estimate the mean weight (in grams) of M&M candies being produced on a certain machine in the factory. After collecting an appropriate random sample of M&M candies, he obtained the following weights:
The hypotheses tested by the one-way ANOVA F test - Evaluate the P-value of the ANOVA F test
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents
Assume that the underlying population variances are equal. a. Are the two samples paired or independent?
At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
A student wants their College to offer Kickboxing classes as a Physical Education class. To justify that the class is desired he surveys 200 students and finds that 56% would be interested in taking the class.
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