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Consider the following frequency distribution: Identify the modal class.
ANOVA is used to determine whether the variance between groups significantly differ from each other.
Suppose that annual precipitation in a Midwestern city follows a normal distribution with a mean of 25 inches and a standard deviation of 4 inches. What is the 99th percentile of annual precipitatio
If Z is a standard normal random variable, then what is Pr(-2.61 < Z < 0.23)? Use four decimal places of accuracy.
If Z is a standard normal random variable, then what is Pr(Z>-2.43)? Use four decimal places of accuracy. Can you also provide an explanation on how you get the answe as well?
Regression analysis is used when the independent variable is nominal or ordinal in nature.
A simple random sample for five executives who went on a diet on their doctors order report the following numbers of pounds lost during their first two weeks on the diet: 5,8,3,7,8. What is the vari
In the referendum on Scottish independence a survey finds that 45% will vote yes while 55% will vote no. On the day, if 92% of yes voters turnout to vote while 75% of no voters turnout and vote, who
A test consists of 10 true or false questions. To pass the test a student must answer at least eight questions correctly. If the student guesses on each question, what is the probability that the st
What is the probability that the fifth email he receied will be the second piece of spam? What is the mean number of emails until the second piece of spam arrives?
What is the probability that the fifth email received will be the second piece of spam? What is the mean number of emails until the second piece of spam arrives?
Alice and Bob want to choose between opera and movie by tossing a coin. Unfortunately, the only coin available is biased (exact bias is not known). How can they use the biased coin to make a decisi
How can you tell when you are to run an independent or a dependent sample test? Give an example to help illustrate your response.
Is the event she passes one course independent of the event that she passes the other course? FALSE (I know this) What is the probability she does not pass either course (has two failing grades)?
Financial analysts like to use the standard deviation as a measure of risk for a stock. The greater the deviation in a stock price over time, the more risky it is to invest in the stock. However, th
Suppose that the distribution is bell-shaped. According to the empirical rule, approximately (68, 75, 95, or 99.7)% of the prison terms actually served lie between 26 months and 66 months.
The presence of bacteria in a urine sample (bacteriuria) is sometimes associated with symptoms of kidney disease in women.Suppose that 20% of adult women have bacteriuria. If a random sample of 20 w
The unemployment rates for various countries ranges from 4.9 to 10.4, with Q1 =5.3 median = 6.6, Q3 = 7.6, a mean of 6.4, and a standard deviation of 2.1. In a boxplot, what would be the values at t
A card is drawn from a standard deck of 52 playing cards. Find the probability that the card is an ace or a heart
A government agency uses a few new scooters for each model every year to collect data on the pollution emission and gasoline mileage performance. For the model Z, what is the subject of the study c
In a data set with a minimum value of 54.5 and a maximum value of 98.6 with 300 observations, there are 186 points less than 81.2. Find the percentile and percentile rank for 81.2.
SAT verbal scores are normally distributed with a mean of 440 and a standard deviation of 96. Use the Empirical Rule to determine what percent of the scores lie between 440 and 632.
The mean IQ score of adults is 100, with a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 70 and 130. (Assume the data set has a bell-shaped di