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Suppose you have the average price for a sample of Lucky Charms at 35 different stores in the valley. Suppose that the population standard deviation for the prices is 1.7. If the population mean is 4.3, what is the z value for a sample average of 4? Answer to two decimal places.
A tollbooth operator has observed that cars arrive randomly at and average randomly at an average rate of 360 cars per hour. (Hint use a Poisson Distribution).
Use Poisson approximations to investigate the following types of coincidences. The usual assumptions of the birthday problem apply, such as that there are 365.
Steve Goodman, production foreman for the Florida Gold Fruit Company, estimates that the average sale of oranges is 4,700 and the standard deviation is 500 oranges. Sales follow a normal distribution.
A sample of 400 students throughout a particular school district reveals a mean score of 498. Estimate the mean score for all the students in the district
Based on these sample results, should Blue dot conclude there is an image difference among the three companies? Use a significance level equal to 0.05.
You want to estimate the proportion of households in the Portland area that have no land-line telephone service. Suppose you plan to take a simple random sample of Portland households and target a margin of error no larger than plus or minus .02 f..
Find the sum of the residuals. Here are the 16 residuals for the NEA data rounded to two decimal places:
a recent report in usa today indicated a typical family of four spends 490 per month on food. assume the distribution
Compare the two political parties.Compare shapes and appropriate measures of the center and spread.
for a normal distribution with ? lt 98.6 given a sample of 25 values with a sample mean of 98.2 and a sample standard
What is the probability that Ford will sell between 2.4 and 2.7 million cars during the next year?
The sample to be 99% sure the sample mean is with 1 semester hour of the population mean for all students at this college?
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