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Computing the mean value for the given data.
1.A set of N = 20 exam scores has a mean of µ = 50. The instructor discovered that one student cheated on the exam so 20 points are subtracted from that student's score. What is the new mean for the class?
a.50
b.49
c.30
d.Cannot be determined from the information given
2.A professor recorded score from a 5-point quiz for each student in an introductory psychology class. If the data are presented in a frequency distribution graph, what type of graph should be used?
a. A bar graph
b. A histogram
c. A polygon
d. Either a histogram or a polygon
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
Construct an appropriate control chart and comment on the process.
Write Cumulative distribution function.Find the cumulative distribution function F(x).
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
Find the probability and mean and standard deviation for given data under Binomial distribution.
Conduct a 3-period moving average, an exponential smoothing forecasting using an alpha of .25, and a seasonal forecast with 3 seasons.
What is the probability that a particular driver had exactly two speeding violations?
For each of the following situations, indicate the appropriate measure, incidence rate or prevalence rate and the numerical value of the rate.
Bougainvilleas, mean growth rate was 2.23 inches/week and sample standard deviation was 0.77 inches/week. Determine a 90% confidence interval for mean growth rate of all Bougainvilleas.
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
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