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In the course of designing theater seats, the sitting heights (in mm) of a simple random of 12 adult women is obtained. The sample mean is 834 mm and standard deviation is 34.98 mm
(a) Assuming that sample is obtained from a population with a normal distribution, construct a 95% confidence Interval estimate for standard deviation, the population standard deviation of sitting height of adult women.
(b) Does the confidence interval contain 35 mm, which is believed to be the standard deviation of sitting heights of women?
The mean weight of 500 students is 151 lbs and the standard deviation is 15 lbs. Assuming the weights are normally distributed, find out how many students weigh between 120 and 155 lbs.
What is the expected time to make a decision? What is your estimate of the standard deviation of the time to make a decision?
a population consists of the following five values 13 14 19 21 and 23.a. list all samples of size 3 and compute the
Is there any evidence to suggest that the true mean time to complete the safety checkup is greater than 30 minutes?
Determine whether the following definitions are stipulative, lexical, precising, theoretical, or persuasive.- "Femikin" means a female manikin.
In a random survey of 226 self-employed individuals, 20 reported having had their tax returns audited by the IRS in the past year. Estimate the proportion of self- employed individuals nationwide who've been audited by the IRS in the past year. a)..
A random sample of 94 customers, who visited a department store, spent an average of $81 at this store. Suppose the standard deviation of expenditures at this store is σ = $20. The 98% confidence interval for the population mean (rounded to two d..
What is the variance of the expected demand in b) above? The investigator believes that the true slope of the relationship is 5. Do the data tend to confirm or deny this hypothesis?
1. Describe this situation, commenting on what the salesperson did correctly and incorrectly.
A simple random sample of 33 observations is derived from a normally distributed population with a known standard deviation of 5.6. Is the condition thatis normally distributed satisfied?
1. construct a confidence interval of the population proportion at the given level of confidence. x120 n300 99
Does a person's favorite color tell us something about how tall the person should be?
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