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Of the 500 students who responded to a survey about recycling on campus, 350 said they recycle on a regular basis. The sample proportion is ??
Open data file on your excel file AirlinePassengers . Point to the level of data (nominal, ordinal, ratio, or interval) measurement for each variable in data set. Notice tab for description gives information about data.
Based on this information, by what factor does the risk of having an accident increase due to driving while intoxicated?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
The mean time to download an Google video is 1 minute 30 seconds. Suppose the download time is normally distributed with standard deviation of 20 seconds.
When using the distribution of sample means to estimate the population mean, what is the benefit of using larger sample sizes?
At the .01 significance level, can she conclude that there is a difference between how well the different tutorials work for the students?
Test the equality of the means of three populations.
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
To test the difference between two means using two mean z test.
In a poll of 1,004 adults, 93% indicated that restaurants and bars should refuse service to patrons who have had too much to drink. Construct the 90% confidence interval for the proportion of all adults who feel the identical way.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Test whether there is significant difference in the test anxiety level of the three groups using nonparametric test.
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