Weights of Elephants A sample of 8 adult elephants had an average weight of 11,700 pounds. The standard deviation for the sample was 22pounds. Find the 90% confidence interval of the population mean for the weights of adult elephants. Assume the variable is normally distributed.Use a graphing calculator and round the answers to the nearest whole number.<<☐G

Given Information:Sample size (n) = 8Sample mean () = 11700 poundsSample standard deviation (s) =…

Answered: Weights of Elephants A sample of 8…

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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Temperature in degrees Fahrenheit has been collected from a sample of 50 individuals. The mean is 98.5 and standard deviation is 3.2. If we convert each observation into degrees in the centigrade scale ((X°C × 9/5) + 32 = Y°F) then what would be the new mean and standard deviation of the set of temperatures?
Interstate Speeds It has been reported that the standard deviation of the speeds of drivers on Interstate 75 near Findlay, Ohio, is 8 miles per hour for all vehicles. A driver feels from experience that this is very low. A survey is conducted, and for 29 drivers the standard deviation is 9.9 miles per hour. At =α0.10, is the driver correct? Assume the variable is normally distributed. State the hypotheses and identify the claim with the correct hypothesis. H0: H1: Claim or Not a Claim? This Hypothesis test is one-tailed or two-tailed? What is the Critical Value?
Suppose that the distribution of income in a certain tax bracket is approximately normal with a mean of $59,194.86 and a standard deviation of $4,454.165. Approximately 22.1% of households had an income greater than what dollar amount? Question 5 options: 1) 55,770.4 2) 62,619.31 3) 15,312,273 4) We do not have enough information to calculate the value. 5) 15,193,883
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The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days and a standard deviation of 14 days. A distribution of values is normal with a mean of 263 and a standard deviation of 14.What percentage of pregnancies last fewer than 252 days?P(X < 252 days) = _________%
How many replicate measurements are necessary to decrease the 99% confidence limits for the analysis above by 50% of the confidence limits. Standard deviation is 0.0721, Mean is 2.43, there are 5 measurements and the z value is 2.58.
population mean is 533.7 and standard deviation is 129.4. suppose you do not know population mean in a random sample of 75 the average spent is 550. find a 98.1% CI for population mean
The class average on a statistics test is 68 marks with a standard deviation of 9 marks. What minimum mark must a student obtain to be in the top 12% of the class? For full marks your answer should be accurate to at least one decimal place. The Top 12.0% Minimum Mark =
A study of life expectancy showed that a random sample of 6 states had a standard deviation of 0.7 deaths per year. Find the 90% confidence intervals of the variance and standard deviation. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi- square values to three decimal places. Round your final answers to one decimal place. < << X S
Breaking Strength of Steel Cable The average breaking strength of a certain brand of steel cable is 2000pounds, with a standard deviation of 100pounds. A sample of 20 cables is selected and tested. Find the sample mean that will cut off the upper 91% of all samples of size 20 taken from the population. Assume the variable is normally distributed. Round intermediate z-value calculations to 2 decimal places and round the final answer to at least 2 decimal places. The sample mean that will cut off the upper 91% of all samples of size 20 is ____ pounds.
A normal population has mean u = 50 and standard deviation o = 5. What is the 80th percentile of the population? Use the TI-84 Plus calculator. Round the answer to at least one decimal place.
You measure 30 watermelons' weights, and find they have a mean weight of 67 ounces. Assume the population standard deviation is 9.3 ounces. Based on this, construct a 88% confidence interval for the true population mean watermelon weight.Give your answers as decimals, to two placesx ± M.O.E. ______ ± ___________ ounces

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