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Some sales representatives want to determine which approach would result in more sales for a manufacturing product. The three approaches are
A random sample of 300 prospective customers was selected with 100 assigned to each of the three different sales approaches. The results are tabulated below:
Sales approach
Videotape
Person sales visit
Phone call
Total
Purchase
19
27
14
60
Didn't purchase
81
73
86
240
100
300
Test if the purchase behaviour is independent of the sales approach at the significance level of 0.05, by answering the following.
(a) State your two hypotheses
(b) Calculate the test statistic
(c) Quote a critical value from Tables. Is your test significant? State your conclusion in plain English.
(d) Regardless of your answer in (c), which cell makes the biggest contribution to the test statistic?
In the graphical method, how do you know when a problem is infeasible, unbounded, or when it has multiple optimal solutions? Give a real-world example of when you could have an infeasible problem.
BMI in children is roughtl normally distributed with the mean of 24.5 and standard deviation of 6.2. BMI of 30 or more is considered obese. Determine proportion of children are obese?
There are 130 cabinets in a row in a warehouse. The first worker to arrive opens the door of every cabinet. The next employee visits every other door and closes it.
For what proportion of patients will drug be effective for between 2 and 2.25 hours?
What is the expected number of patients arriving each Saturday and what is the most probable number of patients arriving each Saturday?
You plan to obtain a simple random sample of 30 students by using the sampling frame of students present next Monday.
A random sample of 81 credit sales in a department store showed an average sale of $68.00. Historically, it is known that the standard deviation of the population is $27.00.
The annual demand for a product is 1,000 units. The company orders 200 units each time an order is placed. The lead-time is 6 days, and the company has determined that 20 unites should be held as a safety stock.
Provide an example of a situation in which factor analysis, cluster analysis, and multidimensional analysis might be used.
In drawing an inference using a single mean in hypothesis testing, you often have a choice between doing a z-test or a t-test. Many researchers will always choose to do the t-test even under circumstances where the z-test would work as well.
the diameter of the dot produced by a printer is normally distributed with a mean diameter of 0.002 inch. suppose that
Looking for a good original (yet cited) response to this definition. And if you can describe two common ones with an example for each that would be great.
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