## Birth Weights of Male Babies| Confidence Interval and Hypothesis Testing for Population Mean and Standard Deviation| Statistics

Birth weights of male babies at one hospital were recorded for 200 births of boys. A mean of that sample was  35.3 hg and a standard deviation of 7.2 hg.  a) Construct a 90% confidence interval for the mean of all boy baby weights. b) A medical Journal claims that the mean weight of male babies is 37.0 hg. Test that claim at a 0.10 level of significance.  c) Use a 0.05 level of significance to test a claim that the real standard deviation of boy birth weights is 6.75 hg.

## Fast food Accuracy| Confidence Interval and Hypothesis Testing for Population Proportion| Statistics

In a recent study of drive-through orders at Burger King, they found out that 365 were accurate and 71 were not accurate. a) Construct a 95% confidence interval for the population percentage of their drive-through order that were not accurate. b) If Burger King claims to have an accuracy of 85% on all drive-through orders, test the claim at the 0.05 levels of significance.

## Problem 1.2| Introduction to Statistics and Data Analysis| Probability & Statistics for Engineers & Scientists 8th Ed| Walpole, Myers, Myers, Ye

According to the journal Chemical Engineering, an important property of a fiber is its water absorbency. A random sample of 20 pieces of cotton fiber is taken and the absorbency on each piece was measured. The following are the absorbency values: 18.71 21.41 20.72 21.81 19.29 22.43 20.17 23.71 19.44 20.50 18.92 20.33 23.00 … Continue reading Problem 1.2| Introduction to Statistics and Data Analysis| Probability & Statistics for Engineers & Scientists 8th Ed| Walpole, Myers, Myers, Ye

## Problem 1.1| Introduction to Statistics and Data Analysis| Probability & Statistics for Engineers & Scientists 8th Ed| Walpole, Myers, Myers, Ye

The following measurements were recorded for the drying time, in hours, of a certain brand of latex paint. 3.4 2.5 4.8 2.9 3.6 2.8 3.3 5.6 3.7 2.8 4.4 4.0 5.2 3.0 4.8 Assume that the measurements are a simple random sample. (a) What is the sample size of the above sample? (b) Calculate the sample … Continue reading Problem 1.1| Introduction to Statistics and Data Analysis| Probability & Statistics for Engineers & Scientists 8th Ed| Walpole, Myers, Myers, Ye

## Succesive Wins: Challenging Problems in Probability

To encourage Elmer's promising tennis career, his father offers him a prize if he wins (at least) two tennis sets in a row in a three-set series to be played with his father and the club champion alternately: father-champion-father or champion-father-champion, according to Elmer's choice. The champion is a better player than Elmer's father. Which series should Elmer choose?

## The Sock Drawer: Probability and Statistics Problem

A drawer contains red socks and black socks. When two socks are drawn at random, the probability that both are red is 1/2. a) How small can the number of socks in the drawer be? b) How small if the number of black socks is even?

## Northern Essex Community College, Quantitative Reasoning-MAT122-01A, Spring 2017: Exam #2

Questions: There is a rack of 15 billiard balls. Balls numbered 1 through 8 are solid-colored. Balls numbered 9 through 15 contain stripes. If one ball is selected at random, determine the odds  against it being solid-colored. A certain lottery requires players to select 4 different numbers, in any order, from 1 to 56 inclusive. … Continue reading Northern Essex Community College, Quantitative Reasoning-MAT122-01A, Spring 2017: Exam #2