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According to a 2010 Nielsen survey, the mean number of apps downloaded by iphone users is 40. Suppose a sample of 36 iphone users downloaded an average of 45 apps, with a sample standard deviation of 24. Test whether the mean population of apps is greater than 40, using a level of significance of 0.10. Use the six step approach to hypothesis testing.
a random variable is normally distributed with a mean of 25 and a standard deviation of 5. if an observation is
According to an IRS study, it takes an average of 330 minutes for taxpayers to prepare, copy, and electronically file a 1040 tax form. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time ..
The researcher in exercise decides to conduct the same study using a within - participates design to control for differences in cognitive ability.
Find the critical value to test the claim that all ages have purchase rates proportional to their driving rates.
components used in a cellular telephone are manufactured with nominal dimension of 0.3 mm and lower and upper
An election poll reported that a candidate has an approval rating of 54% with a margin of error of 4%. Construct a confidence interval for proportion of adults who approve of the candidate.
The winning team's score in 13 high school basketball games was recorded. If the sample mean is 54.3 points and the sample standard deviation is 11.0 points, find the 98% confidence interval of the true mean.
a beam has a solid square cross section of 100mm and simply supported by two supports 3 metres apart. calculate the
If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
If the player does not win or lose on his second roll he continues to roll, using the same criteria given for the second roll.
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
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