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Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The standard deviation of this sample was 2.8 years. At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students?
a. Compute the value of the test statistic.
b. What is your decision regarding the null hypothesis?
c. Interpret your decision from part e in a single sentence.
Compute the variance and standard deviation of the number that will arrive within two days.
If you draw one ball from the urn what is the probability that it is blue or white?
It could not do anything with the airport and suffer a loss of revenue. The current value of raised revenue from a new airport is in question.
Now compute the standard deviation for this distribution.
A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams. Find out the standard deviation.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
By using standard normal table, determine critical value (or values) for= 0.14 right-tailed test.
Consider a Poisson distribution with a mean of two occurrences per time period.
Does the normal distribution yield a good approximation of the actual results?
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
The ANOVA table is given below,as well as a table of means and standard deviations for the three groups. Evaluate the t statistic for testing contrast
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