Recent Homework Questions About Statistics
Exercise 8.92 Tony's Pizza guarantees all pizza deliveries within 30 minutes of the placement of orders. An agency wants to estimate the proportion of all pizzas delivered within 30 minutes by Tony's. What is the most conservative estimate of the sample size that would...
Saturday, November 23, 2013 at 6:10pm
This is not correct
Saturday, November 23, 2013 at 6:08pm
10.9 - +2.575 *6.2/√300 10-+ 0.9217 = (9.98, 11.82)
Saturday, November 23, 2013 at 3:00pm
Use. Population proportion Ho: p = 0.2 Ha: p > 0.2 if P-value is greater than significance level fail to reject Ho: if P-value is less than significance level Reject Ho. z = 2.80 p-value = p ( z > 2.8) = 0.003 Reject the null hypothesis. There is sufficient evidence ...
Saturday, November 23, 2013 at 2:51pm
Type I: rejecting Ho when it is true Type II: failure to reject Ho when it is false answer is false
Saturday, November 23, 2013 at 10:30am
IQ scores were obtained from randomly selected couples.For 20 such pairs of people, the linear correlation coefficient is 0.881 and the equation of the regression line is y= -6.93+ 10.8x, where x represents the IQ score of the husband. Also, the 20x values have a mean of 105....
Saturday, November 23, 2013 at 8:42am
Cannot sketch on these posts. Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
Friday, November 22, 2013 at 2:09pm
Where is your data?
Thursday, November 21, 2013 at 9:41pm
Z = (mean1 - mean2)/standard error (SE) of difference between means SEdiff = √(SEmean1^2 + SEmean2^2) SEm = SD/√n If only one SD is provided, you can use just that to determine SEdiff. Find table in the back of your statistics text labeled something like "...
Thursday, November 21, 2013 at 7:31pm
Thursday, November 21, 2013 at 7:27pm
The effectiveness of a headache medicine is tested by measuring the intensity of a headache in patients before and after drug treatment. The data consist of before and after intensities for each patient. Identify the design of the study. A) Paired t-test B) Two-sample t-test C...
Thursday, November 21, 2013 at 6:40pm