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In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
Can you conclude that information in article is untrue? Use 0.05 significance level. Find out p-value and explain its meaning.
Estimate a test statistic for null hypothesis H0: μ = 30 against two-sided alternative hypothesis H1 : μ ≠ 30, and by plotting this on its reference distribution.
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
Determine the probability, P(Z
Estimate and interpret the p-value of the calculated test statistic above.
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Must the company replace old truck? If so which of new trunks must they use? Describe in detail.
Do any of the selected samples seem to be out of the control limits? Describe.
Also use the regression model to predict a student's average if he/she misses 4 classes.
As sample size increases, the standard error of M _______________ .
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