Normal Distribution Suppose that in a large class, the instructor announces that the average grade on an exam is 75. Which is more likely to be closer to 75:   The exam grade of a randomly selected student in the class?   OR   The mean exam grade of a sample of 10 students?   […]

Sampling Distributions for Means Make a copy of Sampling Distribution for Means  download.  After completing the activity copy and past your answer from #9 in this week’s discussion post.  Please also attach your copy of the entire activity.   MAT308                                […]

A survey is conducted to determine the proportion of young adults who earn less than $15,000.  Two sampling methods are being considered.  Method A involves standing on a downtown street corner and randomly picking several young adults to interview every 10 minutes during a 12-hour period.  Method B involves posting the question on several popular […]

Example 1: Colors of Reese’s Pieces Consider the population of the Reese’s Pieces candies manufactured by Hershey. Suppose that you want to learn about the distribution of colors of these candies but that you can only afford to take a sample of 25 candies.   a) Take a random sample of 25 candies and record […]

A random number generator is used to select a number from 1 to 100. What is the probability of selecting an odd number?     0.077     0.500     0.050     0.250    Question 2(CO 2) What is the sample space of flipping three coins, where H=heads, and T=tails?     (H,H,H)(H,H,H)(H,H,H)(H,H,H)(T,T,T)(T,T,T)(T,T,T)(T,T,T) […]

Among 500 people at the concert, a survey of 35 found 28% found it too loud. What is the population and what is the sample?     Population: 500 at that concert; Sample: the 28% who found it too loud     Population: all concert goers; Sample: the 28% who found it too loud   […]

In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 34% would be considered a:     Statistic     Population     Parameter     Sample    Question 2The chances of winning the Maryland lottery are one chance in twenty-two million. The probability would be considered an example of: […]

Two variables have a positive linear correlation. Does the dependent variable increase or decrease as the independent variable increases?     Cannot determine from information given     Dependent variable would remain the same     Dependent variable increases     Dependent variable decreases    Question 2What does the variable r represent?     The […]

A consumer analyst reports that the mean life of a certain type of alkaline battery is no more than 63 months. Write the null and alternative hypotheses and note which is the claim.     Ho: μ = 63 (claim), Ha: μ ≥ 63     Ho: μ ≤ 63 (claim), Ha: μ > 63 […]

From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 20.53 with a population standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues?     (16.99, 24.07)     (19.62, 21.44)   […]