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A sample of 250 adults tried the new multigrain cereal "Wow!" A total of 187 rated it as excellent. In a sample of 100 children, 66 rated it as excellent. Using the 0.1 significance level, the researcher wishes to show that adults like the cereal better than children. What is the pooled proportion?
.723
1.408
.494
.807
A company is researching the effectiveness of a new website design to decrease the time to access a website. Five website users were randomly selected, and their times (in seconds) to access the website with the old and new designs were recorded. To compare the times, they computed (new website design time - old website design time). The results follow.
user Old web design New web designA 30 25B 45 30C 25 20
D 32 30
E 28 27What is the value of the test statistic?
2.256
1.895
3.747
2.447
Will all three approaches always result in the same conclusion? Explain.
Gerald Black of BlackFly Airline has an exclusive contract to run flights of a four-passenger aircraft to a remote mining center. His contract requires him to fly if there are any passengers wanting to make the trip. His fixed costs per day ar..
What type of variables you have. Qualitative or Quantitative and indicate what type of measurement scale is being used.
A researcher has been hired by a pizzeria to determine which type of crust customers prefer. The restaurant offers three types of crust: hand-tossed, thick, and thin. Following are the mean number of 1-inch pieces of pizza eaten for each condition fr..
In a box model, the maximum distance to transport particle across a city is shown as D. If the approximate length of one side is 40 miles, width is 28 miles and the mixing height is 2miles. For a pollutant particle emitted on one side of the town, wh..
Identify the type of observational study (cross-sectional, retrospective, or prospective) described
4. A simple random sample of 300 items is selected from a large shipment, and testing reveals that 4% of the sampled items are defective. The supplier claims that no more than 2% of the items in the shipment are defective. Carry out an approp..
What is a three-period moving average forecast for the month of July? What is the slope of the regression equation developed when the Sales data are used to predict the Pounds?
Develop a scatter diagram for these data. Try to approximate the relationship between x and y by drawing a straight line through the data.
Calculate the slack time for each activity and for each path and looking at only the critical path, find the probability that the store will take more than 23 working days to open.
If the results on a nationally administered introductory statistics exam is normally distributed with a mean of 100 points and a standard deviation of eight points determine the following: a. describe the graph of the distribution b. find at the Z sc..
Find the area under the normal distribution curve between z = -0.05 and z = 2.85.
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