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A small electronics store has begun to advertise in the local newspaper. Before advertising, the long-term average weekly sales were $9,820. A random sample of 50 weeks while the newspaper ads were running gave a sample mean weekly sales of $10,960. Does this indicate that the population mean weekly sales is now more than $9,820? Test at the 5% level of significance. Assume = $1,580.
Find the P value or an interval containing the P value for the sample test statistic.
When we say we have confidence level of 95% what do you believe our "margin of error" is?
The probability of accepting a lot that is 10% defective is .677. Does that mean, then, that the probability of rejecting the lot is 0.333?
To test whether the population mean is less than a specified value.
At.01 significance level, is there difference in mean number of times men and women order take-out dinners in month? Determine the p -value?
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
For the samples summarized below, test the hypothesis that the two variances are equal, at α = 0.05
If the confidence interval limits do not include age below 20 does it mean that motor cyclists under the age of 20 rarely die in crashes?
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
Are the events "Republican" and "30-44" independent? Justify your answer. Are the events "Democrat" and "65+" independent? Justify your answer.
Perform a linear regression, 8 month moving average & 3 month moving average forecasting technique to see which is most accurate for the new quarter 11 if quarter 11 sales are 172,000 units
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
Assume x is normally distributed with mean u=15 and standard deviation 0=3. Use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions.
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