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A study of internet usage indicated a month average of 36 internet sessions per user from home. A random sample of 24 teenages yielded a mean of 42.1 sessions with a standard deviation of 5.3. (a=.01 level of significance) DO a hypothesis test to determine if this value differs from the population mean. What test? null/alt hypothesis? values? accept/reject? Summarize results.
Fix-It Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed.
If we assume a normal distribution of Diastolic blood pressures, then between what two values can we be assured 99.7% of all Diastolic blood pressures will lie?
Based on the boxplots in part (a), which of the two groups, students or teachers, tends to have watch times that are closer to the true time? explain you choice.
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
in a small town the relationship between robberies and police officers on aduty has been collected. x represents the
It took a contractor 5000 hours to manufacture their first unit of an item. If the contractor expects to achieve a 94% unit learning curve, how many hours would be required to manufacture units 76-100?
Standard deviation of 50. what is the probability that next year the number of burgalaries will be less than 250? less than 300 and more than 350?
a coin is tossed three times. find the probability that the coin lands on tails then heads then
A standard deviation of $125. A) what is the point estimate of the population mean? B) develop a 95% confidence interval for the population mean.
Does the value of the sample linear correlation coefficient, r, indicate that there is a linear dependency between the two variables in the population from which the sample was drawn? Briefly explain how to answer this question.
What would that evaluation be and what is the margin of error?
Can you provide another explanation for this one: Zc/Tc for 86% confidence interval when the sample size 50?
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