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1. A 2003 CBS News poll sampled 523 adults who were planning a vacation during the next 6 months, and found that 141 were expecting to travel by airplane. A similar survey in May 1993 reveled that of 477 adults who were planning a vacation in next 6 months, 81 were planning to travel by airplane.
If the computed value for this problem is +3.79 and the level of significance is 0.01, can we conclude the percentage of people who plan to travel by plane for vacations has changed from 1993 to 2000?
2. A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the previous 3- year period. The results were as follows:
Single Policyholders Married Policyholders
n1 = 400 n2 = 900
Number making claims = 76 Number making claims = 90
Using alpha = 0.05 and a computed value of +4.49, can we conclude that the percentage of claims for married policyholders is less then for single policyholders?
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
Compute the range and interquartile range
If a technical breakthrough occurred that raised the profit per unit of X 1 to $3, would this affect the optimal solution?
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
In which category is ANOVA properly classified?
Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance.
Make use of Excel to determine the right-tail p-value.
Compute mean and standard deviation for sample of N = 8 females and sample of N = 8 for males.
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