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What is the probability that the sample mean price falls within a nickel of the State's overall mean price? i.e between 3.09 and 3.19
The correlation between his test and the BDI was r =.14. Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 90% confident that the true prop
Individual truck drivers are either male or female. In the US 5% of all truck drivers are women, 95% are men. Suppose 20 US truck drivers are randomly selected to be interviewed about their pay.
Household with no children that is equal to the value obtained by the census. Give the z statistic (rounded to two decimal places) and the P-value. What do you conclude?
assume that a set of test scores is normallyh distributed with a mean of 110 and a standard deviation of 25. Use the 68-95-99.7 rule to find the following quantities.
Which of the following would be an appropriate alternative hypothesis? A The mean of the population is equal to 55. B The mean of the sample is equal to 55.
Given that a randomly selected automobile glass is not rejected for safety considerations, determine the probability that it will be rejected for installation concerns.
a recent survey showed that 32% of adults are internet users. suppose that 100 adults are chosen at random. find the probability that 26 of themwill be internet users.
What is the shape of the population distribution? f. What is the shape of the distribution of the sample mean? How do I pay the $20.
the auto parts department of an automotive dealership sends out a mean of 3.6 special orders daily what is the probability that for any day, the number of special orders sent out will be exactly 3?
The average height of a male soldier is 70 inches with a standard deviation of 4 inches. The average height of female soldier is 66 inches with a standard deviation of 4 inches. If a male soldier an
The researcher then records the level of activity for each child during a 30-minute session on the playground. Is this an experimentalor a correlational study? Explain your answer.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and
A researcher plans to compare two treatment conditions by measuring one sample in treatment 1 and a second sample in treatment 2. Briefly explain how the difference simply may be sampling error.
In a random sample of 35 cras owners, an average amount spent on gasoline per week was $15 with a standard deviation of $18. construct and interpret a 90% confidence interval to estimate the mean week
Construct a 99% confidence interval estimate of the population mean amount of olive oil included in a 1-gallon tin. Construct a 95% confidence interval estimate. How does this change your answer to (b
the company selects 50 1994 Polaris cars and records the mileage obtained for each car over a driving course similar to the one used by the EPA. From the sample, the mean was 38.2 mpg. Assume the po
In this procedure, a random sample of 8 gear boxes are removed from the inventory pool of components and are checked for manufacturing defects. Historically, only 5% of the gear boxes have such fl
Suppose that 6% of people are color blind. A researcher selects people at random. Whats the probability that the first color blind person will be found among the first 7 people checked?
Does the sample result suggest that fewer than 90% of the customers are happy with the quality and price of the food? Complete a formal hypothesis test using α = 5%.
In a procedure, a random sample of 8 gear boxes are removed from the inventory pool of components and are checked for manufacturing defects. historically, only 5% of the gear boxes have such flaws.
You pull into a carwash and find all the bays are full and there is a line of cars waiting. People washing cars have an iid exp distribution of finishing. If there are no other cars coming and there
Assume that the tire life is normally distributed with a standard deviation of 500 kilometers. Do you think you could successfully sue the company for false advertising?
Suppose a simple random sample of 30 days is selected for observation. What is the probability that the sample mean for the 30 days will be between 300 and 340 books?