The average salary of 81 random employees in acertain financial sector was 3400 USD. The samplestandard deviation was 270 USD. We areinterested in the 60% confidence interval for thepopulation mean. What is the value of the ta/2used?Select one:O a. 2.639оБ. 1.292О с. 1.664O d. 2.374O e. 0.846O f. 1.990

N=81 Level of significance=0.40

Answered: The average salary of 81 random…

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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You measure 38 dogs' weights, and find they have a mean weight of 68 ounces. Assume the population standard deviation is 9.8 ounces. Based on this, construct a 90% confidence interval for the true population mean dog weight.Give your answers as decimals, to two places ....±...... ounces
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
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The mean length of 25 newly hatched iguanas is 7.47 inches with a standard deviation of 0.77 inches. Assume that the lengths of all newly hatched iguanas are normally distributed. Step 1 of 2 : Calculate the margin of error for a 98% confidence interval. Round your answer to two decimal places.
The average salary of 81 random employees in a certain financial sector was 3400 USD. From past information, we can assume that the standard deviation of the population is 270 USD. We are interested in the 80% confidence interval for the population mean. What is the value of the za/2 used? Select one: O a. 2.326 O b. 1.960 O c. 2.576 O d. 1.282 O e. 1.645 O f. 0.842
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The mean length of 25 newly hatched iguanas is 7.47 inches with a standard deviation of 0.77 inches. Assume that the lengths of all newly hatched iguanas are normally distributed. Step 2 of 2 : Construct a 98% confidence interval for the mean length of all newly hatched iguanas. Round your answer to two decimal places.With 98% confidence, we can say that the mean length of newly hatched iguanas is between _____________________.

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