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A consumer research organization routinely selects several car models each year and evaluates their fuel efficiency .In this year's study of two similar subcompact models from two different automakers ,the average gas mileage for 12 cars of brand A was 27.2 miles per gallon ,and the standard deviation was 3.8 mpg .The nine B brand cars that were tested averaged 32.4 mpg and the standard deviation was 4.3 mpg .At £ = 0.01,should it conclude that brand A cars have lower average gas mileage than do brand B cars?
Because of the increasing nuisance of spam email messages, many start-up companies have emerged to develop e-mail filters
What did he say it would do once it attained power, and why? What inevitable result did he say would come about?
a cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean
1 due to normality the formula for computing z is the same for a single data value as it is for an average of the data
Determine proportion of patients have glucose levels exceeding 115? If the patient has glucose level of 140, what percentile is this?
A college administrator states that the average high school GPA for incoming freshman students is normally distributed with a mean equal to 3.30.
Under similar driving conditions, they were tested again, using a special additive. The data are shown here. At a = 0.05, did the additive improve gas mileage? Use the Wilcoxon signed-rank test.
What is the approximate margin of error that accompanies this result?- What is the interval that is 95% certain to contain the actual proportion of people in this age group who have seen a ghost?
Category of decision rule which contains maximax decision rule is?
a commuter train from long island to new york city is scheduled to arrive at 807 am every weekday morning. the
The unit cost of producing a steak dinner at the Smalltown Inn is $6. If a restaurant charges p dollars for a steak dinner, customers will demand 200 - 5p steak dinners per week. To maximize the profit earned on steak dinners, what price should th..
a preliminary sample of 100 new childrens toys reveals that three of them are unsafe for children under five years old.
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