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When 500 college students are randomly selected and surveyed, it is found that 135 of them own personal computers (based on data from the America Passage Media Corporation).
A. Find the point estimate of the true proportion of all college students who own personal computers.
B. Find a 95% confidence interval for the true proportion of all college students who own personal computers.
The area of study is Sampling Methods and the Central Limit Theorem. Consider the digits in the phone numbers on a randomly selected page of your local phone book a population.
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
Calculated test statistic, decision about the null hypothesis interpretation of results, and a list of references consulted.
A survey of middle-aged men reveals that 28% of them are balding at the crown of their heads. Moreover, it is known that 18% of all middle-aged men who have this balding pattern will suffer a heart attack in the next 10 years.
The director for training at a company that manufactures electronic equipment is interested in determining whether different training methods have an effect on the productivity of assembly line employees.
In 1992, FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive.
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
The sums of squares were computed as SSW = 4773.3 and SSA = 591.2. Use the F test of ANOVA (assume α = 0.05) to decide whether or not there are any differences in true average lumen outputs between the three brands for this type of light bulb.
Suppose you conduct survey asking people if they support something or if they like some product or if they watch some TV-show.
During the period of time phone-in reservations are being taken at a local university, calls come in at a rate of one every ten minutes.
At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations? State your null and alternative hypotheses. (Note: while the small sample size could justify use of the non- parametric Kruskal-W..
Determine the pairs which are significant according to LSD and what pairs are important according to Bonferroni?
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