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A sample of 500 evening students revealed that their annual incomes were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. What is the income that separates the
A study is run to estimate the mean total cholesterol level in children 2-6 years of age. Generate a 95% confidence interval for the true mean total cholesterol levels in adults with a history of hype
A sample of 352 subscribers to Wired magazine shows the mean time spent using the Internet is 13.4 hours per week, with a sample standard deviation of 6.8 hours. Find the 95 percent confidence inter
Does the data support their claim? Use alpha = 0.01. Assume the standard deviation of the price of all new homes sold is $38,000.
Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tail test with α = .05.
Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel.
how much time per day was spent with each mother. In a typical day, the infants spent a total of 18 hours clinging to one of the two mothers.
What is the margin of error? Use 95% confidence. What would you recommend if the study requried a margin of error of $500.
A grab bag contains 11 $1 prizes, 7 $5 prizes, and 2 $20 prizes. Three prizes are chosen at random. What is the probability that exactly two $20 prizes are chosen?
Find each of the following z points, and Use the normal table to find each z point. (Round answers to two decimal places; Use the closest value of Z when there is not an exact match.
an airline has a policy of booking as many as 17 persons on an airline that can seat only 16. (past studies have revealed that only 88% of the booked passengers actually arrive for the flight.) find
Perform hypothesis tests on all five variables (again comparing one group to the other). State the null hypothesis for each. List the p-value and a specific conclusion.
ACT scores for high school students are normally distributed with mean=24.1 and standard deviation=4.3. A student from a high school is randomly selected. Answer the following questions:
If for 15 test areas of equal size he obtained a mean drying time of 66.8 minutes and a standard deviation of 8.7 minutes, construct a 99% confidence interval for the true mean.
A weather forecaster predicts that the May rainfall in a local area will be between three and six inches but has no idea where within the interval the amount will be. Let x be the amount of May rain
a) The prediction equation is y^ = 30 + 0:60x. Find the predicted fi nal exam score for a student who has (i) midterm score = 100, (ii) midterm score = 50. Note that the predicted nal exam score re
Crosset Truck Company bought 48 tires and found that the mean mileage for its trucks is 59,500 miles. Is Crosset's experience different from that claimed by the manufacturer at the .05 significance
Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $ 84.85. At the .01 significance level, can Ms. Brigden conclude that her daily tips average more tha
Find the mean, median, and range for each of the two data sets. b.Find the standard deviation using the rule of thumb for each of the data sets. c.Compare the two sets and describe what you discover
The quality-assurance department sampled 50 customers and found that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3
This information reduces the probability that Julianne is a carrier. Use Bayes' rule to find the conditional probability that Julianne is a carrier, given that she and Jason have one child who does
What is the probability that a randomly selected LED bulb will last at least 20,000 hours? At most 30,000 hours? Between 20,000 and 30,000 hours?
Data on the volume of the boxes can be used to test the null hypothesis that the average volume of the boxes does not vary significantly from factory to factory.
Calculate a 95 percent confidence interval for the mean percentage share of billing volume from network television for the population of all US advertising agencies.
the mean of all possible customer satisfaction ratings for the XYZ Box video game system. Are we 95 percent confident that µ is at least 42, the minimal rating given by a very satisfied custom