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To find the percentage of women between 58 and 80 inches, remember percentage equates with area which is a total of 1.
What are Type I and Type II errors? Why do you want to avoid them?
It seems these days that college graduates who are employed full-time work more than 40-hour weeks. Data are available that can help us decide if this is true
In recent years, a growing array of entertainment option competes for consumer time. By 2004, cable television and radio surpassed broadcast television
Periodically Merrill Lynch customers are asked to evaluate Merrill Lynch¯Financial consultants and services (2000 Merrill Lynch Client Satisfactory Survey)
A magazine is considering the launch of an online edition. The magazine plans to go ahead only if it's convinced that more than 25% of current readers
How does statistics enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study?
T-tests, independent samples, paired and one-way t-tests expalined. When shoud they be used and what kind of data should they be used on?
The amount of money out of income spent on housing is an important component of the cost of living.
The A.C. Nelson Company Collects Data on the TV viewing habits of Americans and publishes the information in the Nielson report on television
Estimate the percentage of students who attend a four-year college if the average class size is 20 and the combined SAT score is 1000.
Find the Z -score and percentiles for the following calculations. Interpret your findings:
For one of the tasks in a manufacturing process, the mean time for tasks completion has historically been 35.0 minutes, with a standard deviation of 2.5 minutes
N comparing the means of two independent samples if the test statistic indicates a significant difference at a=.05, it will also be significant at a=.10
An outbreak of food-borne sickness was attributed to Salmonella enteritidis. It determined that the source of the illness was spinach
Based on this data can the college conclude that the students in the new program performed better than the rest of the class
The following table shows the results after four weeks (number of pounds lost).
Chrysler Corp. is responding to an advertisement by Toyota, which claims that its compact version gets much better gasoline mileage for in-city driving
An industrial plant wants to determine which of two types of fuel, electric or gas, is more cost efficient (measured in cost per unit of energy).
The International Council of Shopping Centers reports that the average teenager spends $39 during a shopping trip to the mall.
Assume that a simple random sample has been selected from a normally distributed population. Find the null and alternative hypotheses, test statistic
Dr. Justin Case wants to explore whether or not students perform better if they cram for a test (massed practice) or if they space their studying over weeks
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
Determine the correlation coefficient between the number of automatic weapons and the murder rate.
Perform a 5 step hypothesis of number of males and females 25 to 29 years of age with bachelor degrees. 1% tcrit. ( percentage expressed using decimals )