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Based on a survey of 1,000 adults by Greenfield Online and resported in a May 2009 USA Today Snapshot, adults 24 years of age and under spend a weekly average of $35 on fast food. If 200 of the adults surveyed were in the age catetory of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
An experiment ws designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were littermates. The rations were assigned at random to the two animals within each pair. The gains (in pounds) after 45 days are shown below:
Assuming weight gain is normal, find the 95% confidence interval estimate for the mean of the differences ?d where d= ration A - ration B.
A biased coin with probability of head being .6 is tossed 12 times. What is the probability that number of head would more than 4 but less than or equal to 10.
question david is an insurance broker who believes that the probability of making a sale is 0.3.a find the mean and
question a political strategist believes that at least 58 of voters in a certain state support his candidate. he then
Assume that probanility that dimond will be stolen is .005, and let x denote insurance company's profit. Compute insurance company's expected profit.
24 of the students in the sample received an "A". Test the instructor's claim at a 5% level of significance. What is your conclusion?
Create a 95% confidence interval for population proportion of positive drug tests.
oh reports that it takes construction workers a mean time of 32 hours and a standard deviation time of 2 hours to
A researcher is interested in determining the partial correlation between age (X) and attitude towards interracial marriage (X), controlling for place of residence (rural or urban) (W).
She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
A hypothesis test is to be used to help determine if there is a difference between the proportion of 2 year college students and private university students that work at least 20 hours per week.
Once production is set up, 80 units can be produced per day. Daily demand rate for the units is 60 per day. a. What is the most economical number to produce per production run? b. How long is each production cycle?
The analysis needs to be re-run adding the error into the regression sum of squares.
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