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The Student Union claims that a population mean amount of spending of undergraduate students at the college is $250 per trimester on textbooks with a population standard deviation of $54. To test this hypothesis, a random sample of 144 undergraduate students is polled and the amount each student spent on textbooks during the trimester is recorded. The sample mean is $260 per trimester on textbooks.
REQUIRED:a) At the 0.05 level of significance, is there evidence that the population mean amount of spending is different from $250 per trimester on textbooks?
b) At the 0.01 level of significance, is there evidence that the population mean amount of spending is different from $250per trimester on Mks?
Construct a 95 percent confidence interval for the mean number of misspelled words in the population of student essays.
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A new cell phone battery is being considered as a replacement for the current one. Ten college student cell phone users are selected to try each battery in their usual mix of "talk" and "standby" and to record the number of hours until recharge wa..
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Test the hypothesis that the annual income of teachers in areas of more than 500,000 is significantly more than those in areas of less than 100,000. Use the 5% level of risk.
Determine a 95 % confidence interval for the iron concentration.
How would you use the concept of probabilities to apply to profiles for hiring more satisfied individuals?
Sample mean is 50, t-statistic is 1.96, and standard error of sample mean is 2. Determine the 95 percent confidence interval?
A TV executive is interested in the popularity of a particular cable TV show. She has been told that a whopping 68% of American households would be interested in tuning in to a new network version of the show.
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