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Faced with rising fax costs, a firm issued a guideline those transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
a) At the .01 level of significance, is the true mean greater than 10?
b) Use Excel to find the right-tail p-value.
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic.
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
How would you find normal approximation to the binomial probability in part a? please show how you would calculate mean and standard deviation in form for normal approximation to the binomial and show the final form you would use w/o going through..
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
Find the 95% confidence interval of the mean number of ER patients treated each day at the hospital.
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.
Choose one time-series describing Airlines and make a line chart. Describe the trend (if any) and discuss possible causes. Fit both a linear and an exponential trend to the data.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Is the z value positive or negative? Explain why it should be positive or negative.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
A shipment of 250 netbooks contains 3 defective units. Determine how many ways a vending maching company can buy three of these units and receive a) no defective units b) all defective units c) at least one good unit.
Can college conclude that students in new program are significantly different from rest of freshmen class? Use two - tailed test with a = 0.05.
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