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Find the
a. explained variation
b. unexplained variation
c. total variation
d. coefficient of determination and
e. standard error of estimate.
The Consumer Price Index (CPI) and the cost of a slice of pizza
CPI 30.2 48.3 112.3 162.2 191.9 197.8
Cost of pizza 0.15 0.35 1.00 1.35 1.50 2.00
Compare the margin of error for the interval estimates in parts (a), (b), and (c). The margin of error (Increases or Decreases) as p-bar gets smaller.
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
If computing a causal linear regression model of y = a + bX and the resultant r2 is very near zero, then one would be able to conclude that:
A random sample of n=31 households is asked the number of TV sets in the household. The responses are-What is the mean number of TVs?
Acme Taxi has two taxi cabs. The manager tracks the daily revenue for each cab. Over the past 20 days, Cab A has averaged $76.00 per night with a standard deviation equal to $11.00.
What is their maximum error of the estimated mean quality for a 92% level of confidence and an estimated standard deviation of 8?
Temperature in certain city for the month of June follows a uniform distribution over the interval 61° F to 91° F. Find the temperature which 90% of the June days exceeds?
One definition of a low-mileage car is one that is 4 years old and has been driven less than 45,000 miles. What percent of the cars returned are considered low-mileage?
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical conclusion about the null hypothesis and final conclusion that addresses the original claim.
What factors might cause the company to order a larger or smaller amount than the EOQ?
In a sample of 64 patients, suppose that 47 showed allergic reduced reaction and 17 show increased reaction. Are these results sufficient to conclude a significant effect?
By using the 0.10 level of significance, is there evidence that the population mean is above the $300?
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