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A cognitive psychologist would like to evaluate the claim that the omega-3 fatty acids in fish can help improve memory in normal adult humans. One group of participants is given a pills containing a large dose of fish extract containing the Omega-3 (500 mg per day), and a second group is given a placebo (sugar pill). The researcher asks each participant to read the front page of the local newspaper thoroughly every day and to take one pill every day. The researcher gives each participant a memory test at the end of two weeks and records how many news items each participant remembers from the past three weeks of news. Answer the following questions about this scenario: A) What names would you give the independent and dependent variables; B) Is the dependent variable discrete or continuous? C) What scale of measurement (nominal, ordinal, interval or ratio; and continuous or discrete) is used to measure the independent variable? D) What research method is being used (experimental or observational)? Explain why you conclude that the research method is one or the other.
A clinical trial is conducted to evaluate the efficacy of a new drug for prevention of hypertension in patients with pre-hypertension
some parts of california are particularly earthquake-prone. suppose that in one such area 31 of all homes are built to
Find out how to minimize cost of meeting demands in Houston and Tampa.
a regional survey of 560 companies asked the vice president of operations how satisfied he or she was with the software
To model this fact, we assume that only half of the goods produced during a week can be used to meet the current week's demand (assume that all of the prior week's ending inventory can be used to meet the current week's demand). Determine how to m..
The quality control process at a manufacturing plant requires that each lot of finished units be sampled for defective items. Twenty units from each lot are inspected.
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Briefly describe co relational research. Name a variable from this study and one from the workplace that might prove to provide a co relational relationship
question an instructor graded a large number of midterm exams and she considers that the test scores are normally
Smaller clearance (i.e., x1 - x2) than 0.09 should be 0.006, what distance between the nominal dimensions of the two parts (i.e., u1 and u2) should be specified by the designer?
The National Turkey Association wants to experiment with three different feed mixtures for very young turkeys. Since no experience exists regarding the three mixtures, no assumptions can be made about the distribution of weights.
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