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A manager believes that the average sales volume per customer is distibuted with a population mean of $100 and a standard deviation of $35. A sample of 50 customers resulted in a sample mean of $90.What is the probability of of obtaining a sample with a sample mean smaller than $90?
Calculate the value of chi-square. What is your decision regarding H 0 ?
Five homes are selected at random: What is the probability none of the six selected homes have a security system? (Round your answer to 3 decimal places.)
The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable-one three digit number wins $600 and all others win nothing-that gamblers never reach "the long run".
At a .01 level of significance, test whether there is a difference between the 2 sample means. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
The null hypothesis is the alternative is Use the given sample data to find out the P-value for the hypothesis test. Provide an interpretation of the P-value.
A certain state lottery awards 418 prizes; 28-$200 prizes, 120-$25 prizes and 270-$20 prizes, for every 10,000 tickets sold.
To model this fact, we assume that only half of the goods produced during a week can be used to meet the current week's demand (assume that all of the prior week's ending inventory can be used to meet the current week's demand). Determine how to m..
A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score.
Looking at the data, you suspect that the manufacturer is incorrect in its label claim. You want to perform hypothesis testing to prove or disprove it.
A description of a Pew Research Center poll referred to "the random generation of the last two digits of telephone numbers." Each digits has the same chance of being randomly generated. Construct a table representing the probability distribution f..
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
The data given below represent the annual gross revenue (N'millions) obtained by a telephone company over the periods 1987 - 1996:
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