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Acme Veggies conducted surveys in two cities to see what attitudes are like regarding organic vegetables and prices. In city A 75 out of 150 would pay more for organics while in B the result was 80 out of 200.
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha.
b) What does your result say about attitude consistency across cities?
Which distribution should be used to create 80% confidence interval?
If computing a causal linear regression model of y = a + bX and the resultant r2 is very near zero, then one would be able to conclude that:
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
For the following scores, find the (A) mean, (B) median, (C) sum of squared deviation (d) variance, and (e) standard deviation:
Describe your answer to a person who has never had a course in statistics.
Reject H0 at β β = .01; there is evidence of a difference between the mean voter turnouts for urban, suburban, and rural precincts.
When a sample mean is greater than the true, population mean, the resulting difference is called:
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
Comparison of paired and unpaired samples test - Identify which of the two tests (Independent samples and Paired samples) test is the preferred test and justify your choice.
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
What is critical z-value which corresponds to confidence level of 88%.
Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.
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