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In considering doing a logistic regression using the Enter method, it was suggested that I may want to consider doing a sequential LSR or stepwise logistic regression instead.
What exactly are the advantages and disadvantages of each of these options, and what criteria should I use in order to decide which method is best?
What are the conditions under which logistic regression is more preferable compared to ordinary least squares regression? Is there a logistic regression equivalent to the R square statistic?
The mean and the standard deviation of a sample of 100 bank customer waiting times are 5.46 and 2.475 minutes, respectively. a) Assuming the distribution is bell-shaped, calculate the waiting time intervals containing 68% and 95% of bank customer w..
What can we conclude from these figures at a level of significance of .01?
Is the hot-air balloon significantly shorter than light rail? How can you tell? What do you tell university officials?
The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
Find the critical values and identify the rejection regions. Calculate d and sd. Use the t-test to find the standardized test statistic t. decide whether to reject or fail to reject the null hypothesis.
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
Suppose that combined verbal and math SAT scores follow a normal distribution with mean 896 and standard deviation 174. Suppose further that Peter finds out that he scored in the top 3% of SAT scores. Determine how high Peter's score must have bee..
A new improved rocket launching system is being considered for short-range assault rockets. The requirement is that 80% of the rockets shall strike the target area at 800 meters. A sample of 36 experimental launches is made with 29 striking the ta..
The owner was interested in the mean time required to service this model, and decided not to carry the model if the mean repair time appeared to be more than 40 minutes.
The mean amount purchased by a typical customer at Churchill\'s Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the foll..
The standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha fetoprotein. Using the test 80% of Down's syndrome cases can be identified while 5% of normals are detected as positives.
At the 0.01 level of significance, is there evidence to support the professor's claim?
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