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Question: For each of the following examples, identify whether the research has expressed a directional or non directional hypothesis:
a. A researcher is interested in studying the use of antibacterial products and the dryness of people's skin. He thinks these products might alter the moisture in skin compared to other products that are not antibacterial.
b. A student wonders if grades in a class are in any way related to where a student sits in the classroom. In particular, do students who sit in the front row get better grades, on average, than the general population of students?
c. Cell phones are everywhere and we are now available by phone almost all of the time. Does this translate into a change in the nature or closeness of our long-distance relationships?
suppose that an investigator believes that virtually all values in the population are between 38 and 70. the
a polling company obtains an alphabetical list of names of voters in a precinct. they select every 20th person from
A certain airplane has two alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is.02.
Create appropriate graphical displays for both groups, and write a brief report comparing their cholesterol levels. Here are the data:
which of the following is not a requirement for regression analysis?a outliers can have a strong effect on the
the expected values for each cell in a chi-square test are the values to be expected in each cell ifanswerthe sample is
Is it possible to find an elementary matrix E such that EB = C? Justify your answer in a proof. Write the matrix 3 -2 as a product of elementary matrices.
Write a program to toss a coin 10,000 times. Let Sn be the number of heads in the first n tosses. Have your program print out, after every 1000 tosses, Sn - n/2. On the basis of this simulation
Show that the Patriots should go for the first down if p > 1 - q/r. Here, p is the probability the Patriots make the first down, q is the probability the Colts.
a facilities manager at a university reads in a research report that the mean amount of time spent in the shower by an
A least squares linear trend line is just a simple regression line with the independent variable being time (months or years for example).
At the current time, the Sports Exports Company focuses on producing footballs and exporting them to a distributor in the United Kingdom. The exports are denominated in British pounds.
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