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Management is contemplating selling the company's products through the internet. Before a decision is made, several studies will have to be carried out. One of them is to estimate the proportion of adult Georgian who have access to the internet at home. A survey is carried out. We find that out of 800 randomly interviewed adult Georgian, 330 have access to the internet.
a) Further to the survey results, would management be correct in concluding that more than 40% of adult Georgian s have access to the internet? (Carry out a test of hypothesis using a significance level of 1%)
b) Compute the power of the previous test if the true proportion of adults having access to the internet in the population is 41%. What is the power if the true proportion is 42%? 43%? 44%? 45%? Redo the computations for α = 10%. What do we notice?
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
What percentage of personal checking account customers carry average daily balances in excess of $800? What percentage of the banks customers carries average daily balances below of $200?
What is the probability of selecting a female or an accounting major? Which rule of addition did you apply?
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Determine the lowest weight a student can have and still be qualified to enter the school.
The hypothesis test produces a z-score of z = -2.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision.
If you are using exponential smoothing for forecasting an annual time series of revenues, what is your forecast for the next year if the smoothed value for this year is $32.4 million?
Ffind the probability that exactly 7 of the 10 consumers recognize the brand name. Also find the probability that the number who recognize the brand name is not 7.
State the hypotheses for a right-tailed test. Obtain a test statistic and p-value assuming unequal variances. Why might the sample data not follow a normal, bell-shaped curve? If not, how might this affect your conclusions?
A deck of cards is shuffled and then divided into two piles of 26 cards each. We say that a suit is unsplit if all 13 cards of that suit are in the same pile. Compute the probability that at least one suit will be unsplit.
To guarantee that cans of soda are properly filled, some cans are sampled and the amounts measured. The overall average for the samples is 12 ounces.
Variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
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