Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 99% confidence interval estimate of the population standarddeviation.65606057 6052616061685869 OE Click the icon to view the table of Chi-Square critical values.The confidence interval estimate ismi/h

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Answered: Listed below are speeds (mi/h) measured…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A business school placement director wants to estimate the mean annual salaries five years after students graduate. A random sample of 25 such graduates found a sample mean of R42740 and a sample standard deviation of R4780. Find a 90% confidence interval for the population mean, assuming that the population distribution is normal.
Listed below are the amounts of net worth (in millions of dollars) of the ten wealthiest celebrities in a country. Construct a 99% confidence interval. What does the result tell us about the population of all celebrities? Do the data appear to be from a normally distributed population as required? 261198182170161153148148143143
"A company produces resistors by the thousands, and Gerry is in charge of quality control. He picks 26 resistors at random as a sample, and calculates the sample mean x = 7.268 kOhms and sample standard deviation S = 0.2142 kOhms. Calculate the confidence interval as a (+/-) value to 65% confidence level."
according to the International Journal of Retail and Distribution Management (Vol. 39, 2011) survey of Black Friday shoppers. One question was “How many hours do you usually spend shopping on Black Friday?” What size sample would be required to estimate the population mean number of hours spent shopping on Black Friday if you want the estimate to be within 0.5 hours at the 99% confidence interval, given a population standard deviation of 2.72 hours m = σ = zα/2 = n =
A soft-drink manufacturer purchases aluminum cans from an outside vendor. A random sample of 70 cans is selected from a large shipment, and each is tested for strength by applying an increasing load to the side of the can until it punctures. Of the 70 cans, 59 meet the specification for puncture resistance. (a) Find a 95% confidence interval for the proportion of cans in the shipment that meet the specification. (b) How to interpret the confidence interval in part (a)? (c) Find the sample size needed for a 90% confidence interval to specify the proportion to within ±0.06. (d) If a 90% confidence interval is computed each day for 300 days, what is the probability that more than 280 of the confidence intervals cover the true proportions?
The local police department attempted to estimate average vehicle speeds along a strip of Main Street. Using hidden radar, the velocity of a random group of 32 vehicles was measured, yielding a sample average of 36 mph. Assume a population standard deviation of 4 mph. A-Find the standard error of the mean. B- Find the 95% (two - tailed) confidence interval for the population mean. c. How many total vehicles would we need to measure if we wanted our confidence interval to be half as large?
Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 98% confidence interval estimate of the population standard deviation. 65 62 62 56 62 55 61 60 61 70 60 68 Use the table of Chi-Square critical values. The confidence interval estimate is mi/h<σ<mi/h. (Round to one decimal place as needed.)
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 69 hours. A random sample of 36 light bulbs indicated a sample mean life of 260 hours. Complete parts (a) through (d) below. Construct a 99% confidence interval estimate for the population mean life of light bulbs in this shipment. The 99% confidence interval estimate is from a lower limit of enter your response here hours to an upper limit of enter your response here hours. (Round to one decimal place as needed.)
Find the critical value, t c, used for a 95% confidence interval for the mean with a sample size of 28. Round to three decimal places.
Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was0.110.11 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. (b) Construct a 98% confidence interval about the sample mean concentration of calcium precipitation. (c) below. data table 0.074 0.079 0.073 0.272 0.127 0.189 0.117 0.223 0.305 0.115
Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P.M. on a weekday. Use the sample data to construct a 98% confidence interval estimate of the population standard deviation. 65 62 62 56 62 55 61 60 61 70 60 68 Use the table of Chi-Square critical values. The confidence interval estimate is mi/h<σ< mi/h.
The prevalence rate of osteoporosis among women were measured in a survey, p(%) = 25.3 SE (p) = 1.8 calculate the upper bound of 95% confidence interval

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