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Please expalin how do you solve this problem,
We expect that students who do well on the midterm exam in a course will usually also do well on the final exam. An instructor looked at the exam scores of all 342 students who took her statistics class over a 10-year period. The least-squares line for predicting final exam score from midterm-exam score was y^=44.9+0.37x. (Both exams have a 100-point scale)
Octavio scores 12 points above the class mean on the midterm. How many points above the class mean do you predict that he will score on the final?
Score:
This is another example of regression to the mean: students who do well on the midterm will on average do less well, but still above average, on the final.
q1. show that for a sample of n 39 the smallest and largest z values are - 1.96 and 1.96 and the middle i.e. 20th z
an experiment consists of tossing three unfair coins where the probabilty of tossing a head on each is 25. construct
According to a recent survey, Americans get a mean of 7 hours of sleep per night. A random sample of 50 students at West Virginia University revealed the mean number of hours slept last night was 6 hours and 48 minutes
The fixed monthly cost of operating the production facility is $3000. How many units of part # 2206 have to be sold in a month to break-even?
What proportion of the first 70 digits in the table are 0s (there are 40 digits in line 101 followed by the first 30 in line 102)?
If you were to draw a scatter plot of the number of women in the workforce versus the number of Christmas trees sold in the United States for each year between 1930 and the present
Sensitivity of 0.98 and false-positive rate of 0.01. Calculate and interpret meaning of PV+, if test is used in the population which has the disease prevalence of 0.001.
you start with scatterplots and correlation before regression; scatterplots need to be much more refined to be of use; so, you have a relationship - how much of the variation does the model explain and what are the practical conclusions?
Develop a correlation matrix. Which independent variable has the strongest correlation with the dependent variable? Does it appear there will be any problems with multicollinearity?
For monthly volume of 300 tables, find out total cost, total revenue and profit.
Describe each set of data with a histogram (use the same class intervals on both histograms) the mean, standard deviation.
etting the significance level at a very high cutoff (such as 15%) increases chances of what type of error? Why do Type II errors concern scientists? Why have confidence levels of significance been set at 5% and 1%?
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