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Q1) Biting the un-popped kernel of popcorn hurts! As the experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and places them in the popper. After popping, un-poppedkernels were calculated. There were 86.
a) Create a 90% confidence interval for proportion of all kernels that would not pop.
b) Check the normality assumption.
c) Try Very QuickRule. Does it work well here? Explain why, or why not?
d) Why might this sample not be typical?
Determine the value of correlation coefficient between these 2 variables?
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
The weight of the oranges, in pounds (1 pound = 16 ounces) is a random variable with standard deviation
Assume that demand for the upcoming weekend is normally distributed with a standard deviation of 30.
Consider the following time plot of the values of variable Y for each month of a 60-month period. This plot displays
Here is a scatterplot of average crawling age versus average outdoor temperature six months after birth followed by a plot of the residuals versus average outdoor temperature six months after birth.
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
Find out optimal decision
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
Find the standard error of the difference in sample means,
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