What is the explanatory variable in this study

Assignment Help Basic Statistics
Reference no: EM137687

1. There are two statistics classes. The first has 250 students and the second has 200 students. In the first class the students are instructed to toss a coin 20 times and record the value of , the proportion of heads. The instructor then makes a histogram of the 250 values of obtained. In the second class the students are instructed to toss a coin 40 times and record the value of , the proportion of heads. The instructor then makes a histogram of the 200 values of obtained. The histogram of values for the first class should be

A. more biased since it is based on a smaller number of tosses.
B. more variable since it is based on a smaller number of tosses.
C. less variable since it is based on a larger number of students.

2. Twelve people who suffer from chronic fatigue syndrome volunteer to take part in an experiment to see if shark fin extract will increase one's energy level. Eight of the volunteers are men and four are women. Half of the volunteers are to be given shark fin extract twice a day and the other half a placebo twice a day. We wish to make sure that 4 men and 2 women are assigned to each of the treatments, so we decide to use a block design with the men forming one block and the women the other. The names of the men and women are given in the chart and each name is given a numerical label.

Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.

The people assigned to the shark fin treatment are

952_What is the explanatory variable in this study.gif

A. 5, 7, 5, 4, 1, 1.
B. Lewis, Simpson, Howard, and Braun. We must give both Lewis and Braun a double dose since they are selected twice.
C. Lewis, Simpson, Howard, Adams, Braun, Miller.

3. A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car. If it shows an even number she takes the freeway; if it shows an odd number, she takes the in-town route. She records the total time each day. What is the explanatory variable in this study?

A. the route
B. the odometer reading
C. the time to school

Reference no: EM137687

Is the standard deviation a resistant statistic

Remember that a resistant statistic is a numerical summary whose value is not unduly influenced by an outlier of any magnitude. Is the standard deviation a resistant statist

Overstepping ethical boundaries for stakeholder

Include at least one example of a company overstepping ethical boundaries for stakeholder agendas, and what types of preventative measures could be taken to avoid this type

Testing of hypothesis-nature of z statistic

The value of the z-score that is obtained for a hypothesis test is influence by several factors. Some factors influence the size of the numerator of the z-score and the fact

Discriminant and solutions to quadratic equation

Determine whether the following equations have a solution or not? Justify your answer. What type of solution do you get for quadratic equations where D

Correlation between the amount spent and gender

At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of m

Regression model for estimating a student

What slope, part 2? If you create a regression model for estimating a student's business school GPA (on a scale of 1-5) based on his math SAT (on a scale of 200-800), is the

Frequency distributions-graphs

The Dean of your school has asked you to organize and present data from a one-question (one-variable) survey to determine students' satisfaction in the social work program.

Probability that one is a republican followed by democrat

If two voters are randomly selected for a telephone survey, what is the probability that they one is a Republican followed by a Democrat? Round your answer to 4 decimal plac

Reviews

Write a Review

 
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd