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A certain exterminator specializes in Apexis rodents. Apexis rodents ALWAYS infest the basement of a house. They sometimes, but not always, infest the rooms of the house. When the exterminator looks for the Apexis nest in the basement he has a 10% chance, every minute, of finding it. There is a 40% chance that any given room of the house is infested. Let Y be the number of minutes spent searching the basement for the Apexis rodents. Let X be the number of rooms in a six room house infested by Apexis rodents. The exterminators statistician assures him that X and Y are independent
a. What is the distribution of X? State its mean and variance.
b. What is the distribution of Y? State its mean and variance.
c. The exterminator charges a hefty fifty dollars for every minute spent searching the basement. However he feels bad when the infestation goes beyond the basement and refunds 5 dollars for every room that is infested. Let C be the amount charged to an infested house. Find the expected value and variance of C.
d. Find E (XY)
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
The explanatory variable which is a measure of neighborhood socio-economic status variable RFM. Response variable is percent (%) of bicycle riders that wears a helmet.
College Students' Seating Choices and Motivation to Achieve.This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
If the population mean is estimated within two days, how many salespeople should be sampled?
Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1,150
Depends on the satellite information illustrate what is the expected number µ of real forest fires on the Seward Peninsula.
Find out 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
Findout the probability value for normal distribution. Illustrate the weight of football players is normally distributed with a mean of 200 pounds also a standard deviation of 25 pounds.
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.
Hours worked is important predictor of amount of sales.
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
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