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A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost. A marketing campaign will be initiated if there is evidence that more than 20% of the customers would accept this deal, if it were offered to them. At the 0.05 level of significance, is there evidence that more than 20% of the customers would purchase the additional number?
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Using quadratic regression model find the estimated number of planes.
Find the probability of committing a type I error.
If x is a binomial random variable where n = 100 and p = .1, find the possibility that x is less than or equal to 10 using the normal approximation to the binomial.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out of pocket?
Aggregate the opinions of the experts by computing the minimum, maximum, 25 th percentile, 50 th percentile, and 75 th percentile values.
Critically the difference between Paramaeter and Statistics and Critically discuss the concept of operationalize? What are focus groups
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 does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
The bank wants to find out the waiting time of their customers during the Friday evening hours from 5pm to 8pm. Using the data in ungrouped form, compute the Standard Deviation, using the computational formula.
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