
Problem set for PA551
... data this year from a sample of 144 stretches of roadway shows a mean of 38 accidents per 10 miles with a standard deviation of 24. Is this a statistically significant decrease (.05 level) in the accident rate? Is this a statistically significant decrease (.01 level) in the accident rate? (z=-2; rej ...
... data this year from a sample of 144 stretches of roadway shows a mean of 38 accidents per 10 miles with a standard deviation of 24. Is this a statistically significant decrease (.05 level) in the accident rate? Is this a statistically significant decrease (.01 level) in the accident rate? (z=-2; rej ...
Slides - Georgia Tech ISyE
... -‐ test for sample proporTon parameter 6. Use data available: -‐ perform test to reach a decision -‐ and report p-‐value ...
... -‐ test for sample proporTon parameter 6. Use data available: -‐ perform test to reach a decision -‐ and report p-‐value ...
Exam 1
... From the confidence interval results we know that with 95% assurance the slope is in the range [-0.243,-0.029], in particular at least with 95% assurance the slope is negative. Comment: Even though the R-square is relatively small, this only casts doubt on the predicted values of slope and intercept ...
... From the confidence interval results we know that with 95% assurance the slope is in the range [-0.243,-0.029], in particular at least with 95% assurance the slope is negative. Comment: Even though the R-square is relatively small, this only casts doubt on the predicted values of slope and intercept ...
Chapter 23 Powerpoint dv01_23
... • Remember that “statistically significant” does not mean “actually important” or “meaningful.” – Because of this, it’s always a good idea when we test a hypothesis to check the confidence interval and think about likely values for the mean. ...
... • Remember that “statistically significant” does not mean “actually important” or “meaningful.” – Because of this, it’s always a good idea when we test a hypothesis to check the confidence interval and think about likely values for the mean. ...
WED_UnivStats - KEATS
... If the NH were true, we would expect the two rank sums to be about the same The smaller the T, the lower the probability of the data arising by chance. The T is compared with the expected smallest T given the sample sizes of each group if smaller p<0.05 ...
... If the NH were true, we would expect the two rank sums to be about the same The smaller the T, the lower the probability of the data arising by chance. The T is compared with the expected smallest T given the sample sizes of each group if smaller p<0.05 ...
Marketing Research
... Researcher must decide whether sample size dictated by budget constraints allows a worthwhile study to be conducted ...
... Researcher must decide whether sample size dictated by budget constraints allows a worthwhile study to be conducted ...