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According to Cellular Telecommunications industry Association, the average local monthly cell phone bill is $42.78. Suppose local monthly cell phone bills are normally distributed, with a standard deviation of $11.35.
a) What is the probability that a randomly selected cell phone bill is more than $67.75?
b) What is the probability that a randomly selected cell phone bill is no more than $25?
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho= 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Only 10% of American adults can name the capital of the Czech Republic. On a television game show the three randomly selected contestants are given the question "What is the capital of the Czech Republic?" The probability that none of them will kn..
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
Conduct the hypothesis test and compute the p-value. At a 0.05 level of significance, what is your conclusion?
Estimate a test statistic for null hypothesis H0: μ = 30 against two-sided alternative hypothesis H1 : μ ≠ 30, and by plotting this on its reference distribution.
Calculate and plot t he new supply schedule and indicate the new equilibrium price and quantity on your diagram
The random variable X has which of the following probability distributions and What is the probability that no student wins
what is the probability that at least 8 of the words on the test are words that the student knows?
Complete the table and answer the following questions. Use the .05 significance level.
A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.8 hours.
Use a 0.05 significance level to test the claim of a cereal lobbyist that the mean for all cereals is less than 0.3g.
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