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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
Is this a one- or two-tailed test?
Bob's, a fast-food chain specializing in hot dogs and garlic fries, keeps track of the proportion of its customers who decide to eat in the restaurant (as opposed to ordering the food "to go") so it can make decisions regarding the possible construct..
Find a peer-reviewed article that provides an example of a study that utilized a t-test for a single sample (on a topic of interest to you). Briefly describe the study and discuss its findings.
Run the Wilcoxon rank-sum test to show whether there is a statistically significant difference between the mortality rates of children under the age of five years of the regions
The random var x has a normal distribution with population mean (u) of 40 and a population variance (q^2) of 36. Find the value of x. Call it x0, such that... A) P (X >= x0) = 0.10 B) P(X =x0) = 0.40
Suppose that two students named Gwyneth and Josephine have a total of 20 CDs in their room, consisting of 5 blues CDs and 15 reggae CDs. Each of the students chooses 7 CDs at random (without replacement), with all choices equally likely. (Thus, a..
1.) The mean number of English courses taken in a two-year time period by male and female college students is believed to be about the same. An experiment is conducted and data are collected from 29 males and 16 females. The males took an average of ..
A second researcher doubts these findings, believing that the actual figure is higher. To attempt to resolve the question, a simple random sample of 60 preschool children is chosen, and their TV watching habits are measured by having their parents ke..
List all necessary assumptions and indicate which might be suspect. Also perform a non-parametric analysis. Verify your results using SAS - Determine the subset of variables that is selected as best by the forward selection procedure using Fo = 4.2 ..
A university librarian wanted to determine if social sciences undergraduates had a preferred method for searching the Internet for sources for academic papers. Over a 5-day period she randomly surveyed 100 students who came into the CSUDH library and..
1 )The college student senate is sponsoring a spring break Caribbean cruise raffle. The proceeds are to be donated to the Samaritan Center for the Homeless. A local travel agency donated the cruise, valued at $2000. The students sold 2544 raffle tick..
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..
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