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The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in addition to attending classes. At one university, it is believed that the average hours students work per week exceeds 20. To test this at a significance level of 0.05, a random sample of n = 20 students was selected and the following values were observed:
26 15 10 40
10 20 30 36
40 0 5 10
20 32 16 12
40 36 10 0
Based on these sample data, the critical value expressed in hours:
is approximately equal to 25.0 hours.
is approximately equal to 25.26 hours.
is approximately 22 hours.
cannot be determined without knowing the population standard deviation.
A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families.
What is the probability that a randomly selected respondent has a goal of getting rich?
Suppose the random variable x is best described by a normal distribution with µ = 24 and σ = 2.7. Find the z-score that corresponds to each of the following x values.
suppose a sample of 19 scores has a mean of 67.43. two additional scores are added to the sample with values of 64.4
A simple random sample of 60 voters will be drawn from this population. The chance the sample contains only Republicans and Democrats is?
If a filled container of juice is selected at random, what is the probability that it is a nonconforming container? If a filled container of juice is selected at random, what is the probability that it was filled on machine II?
A real estate investor has two houses: A and B. Each house may increase in value, decrease in value, or remain unchanged. Consider the experiment of investing in the two houses and observing the change (if any) in value:
Determine the confidence level used for the given confidence interval.
A compute manufacturer is about to unveil a new,faster PC.The new PC is faster but intial tests incidcate there is more variation in the processing time.
A telephone call from a certain person is received some time between 7:00 A.M. and 9:10 A.M. every day. Define a sample space for this phenomenon, and describe the event that the call arrives within 15 minutes of the hour.
Given the following data on the number of pints of ice cream sod at a local ice cream store for a 6 period time frame. Compute a 3 period moving average for period 4
the length of useful life a fluorescent tube used for indoor gardening is normally distrubuted. the useful life has a
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