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A random sample of 174 college students was asked to indicate the number of hours per week that they surf the internet for either personal information or material for a class assignment. The sample mean response was 6.06 hours and the sample standard deviation was 1.43 hours. Based on these results a confidence interval extending from 5.96 to 6.16 was calculated for the population mean. Find the confidence level of this interval.
A sample from a population with μ = 40 and =σ10 has a mean of m = 44. if the sample mean corresponds to a z = 2.00, then how many scores are in the sample?
Normal distribution of 5 pounds per square inch, standard deviation of 1.5 pounds per square inch, what proportion have less that 3.17 pounds per square inch, at least 3.6 pounds, are between 5 and 5.5 and 95% will be contained between what two va..
The third will be made an offer only if the committee should reject both the first and the second. How many possible ordered choices of three out of six candidates are there?
Using the above database, compute a t-test comparing males' and females' heights. You must determine which type of t-test to compute. Write a short interpretation of the results.
What is the appropriate procedure to test for a significant difference in means between the two groups? Implement the procedure in problem using the critical value method
According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed.
In an early study, researchers at an Ivy University found that 33% of the freshmen had received at least one A in their first semester.
What is the null and alternative hypothesis? What is your final conclusion?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Illustrate what can we say about the probability distribution. Is it approximately normal, elucidate the mean and standard deviation.
Precisely (i.e., using specific numbers) what does central limit theorem tell us about sampling distribution of sample means for samples of this size from this population?
An analysis of variances produces SSbetween treatments = 20 with df between treatments = 2, and SS within treatments = 30 with df within treatments = 15. For this analysis, what is the F-ratio?
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