Confidence interval for the variance and standard deviation
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Assume that the standard deviation of daily internet usage time is 1 hour for all university students in Taiwan. Given a random sample of n such students:
Mention all the possible values of X. Determine the discrete density function for X. Determine the mode(s) of X
Linear function G(t) provides total number of exams graded on the given day where t is hours after 8 a.m. On this given day G(3)=40 and G(6)=106. Determine function G(t) and then interpret G^-1(62).
Two events involve getting two aces when two cards are drawn from a deck of playing cards and replacing the first card before the drawing the second card. The twoevents in this statement are:
Determine the 90% confidence interval for the variance and standard deviation of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2.3 years. Suppose the variable is normally distributed.
In 2010 one homeowner's quarterly bill ranged fom the high of $122.54 to the low of $68.50. Over what range water usage differed?
Assume the medication was absolutely worthless. Determine the probability that at least nine of the ten receiving the medication will recover?
A statistics teacher wants to grade test on a curve. She has found that the mean of test was 72% with standard deviation of 6%. If the teacher wants the top 15% of the class to get an A, what would be the cut-off score be? If middle 30% receive a
The rancher has 1200 feet of fencing to enclose 2 adjacent rectangular corrals of equal lengths and widths. State the area, A, of two rectangles as the function of width, x.
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