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Conduct an historical study of a random variable of your choice, collect a sample of observations and provide detailed descriptions of this sample.
The proportions of blood phenotypes A, B, AB, and O in the population of all Caucasians in the United States are .41, .10, .04, and .45, respectively. To determine whether or not the actual populati
Construct a 96% confidence interval for the true mean breaking strength of a certain type of 10 ft. long cables. Assume that there are 100 such cables with mean = 457 lbs while the standard deviatio
As a commercial buyer for a private supermarket brand, suppose you take a random sample of 12 cans of beans packed at a canning plant. The mean weight per can is found out to be 15.97oz with standa
A prospective purchaser of a toy store wishes to estimate the mean dollar amount of sales per customer at a toy store located at an airline terminal. Based on information collected from similar airp
The economy may be headed for recession. As the manager of a bank, you would like to know the average income of the bank's credit card customers. A sample of 100 randomly selected customers yields
What percentage of the population will have scores greater than 80? For a sample of 81 scores randomly selected from this population, what is the probability that the average score of the sample is g
Compute an 80% confidence interval for the population mean (mhu) of rim diameters for such ceramic vesselsfound at the Wind Mountain archaelogical site.
You have constructed a standardized least-squares regression line to explore how hours worked and stress influence grades. What is the value of the Y intercept?
What is the expected turnout for a city in which the unemployment rate was 10% and 75% of the campaign ads were negative? Round to the nearest whole number (no decimals).
What is the probability that a randomly selected person will figure out the killer within the first 20 minutes?Q. What is the probability that a randomly selected person will still not know who the
It is well known that the time it takes to be served an order of wings at a downtown bar, from the moment of placing the order, is normally distributed with a mean of 28 minutes and a standard devia
In "Boston Record Game Fishes", it is stated that in the Cozumel region, approximately 40% of strikes (while trolling) result in a catch. Suppose that on a given day a fleet of fishing boats got a t
The National Study of the Changing Workforce conducted an extensive survey of 2958 wage and salaried workers on issues ranging from relationships with their bosses to household chores.
You are dealt a hand of three cards from a standard deck of cards, one at a time. What is the probability that the first red card you get is the third card dealt? Show how and provide the answer to
Permutations with objects together: How many ways can the words be rearranged in ALLABABA with BABA together? Permutations with objects NOT together: How many ways can the word be rearranged in CRESPI
There are 7 guards and 6 centers trying out for the starting 5 in a basketball team with specific positions. Find the number of ways to select the starting 5 and put them into their positions.
If a confidence interval for the difference between a pair of treatment means includes 0, then we fail to reject the null hypothesis that there is no difference in the pair of treatment means.
Three experiments delving into the relationship between the neccecisity for cognitive closure and persuasion were reported in "Motivated Resistance and Openess to Persuasion in the Presence or Absen
The Wind Mountain archaeological site is located in soutwestern New Mexico. Wind Mountain was home to a culture of prehistoric Native Americans called Anasazi. A random sample of excavations at Wind
In "Boston Record Game Fishes", it is stated that in the Cozumel region, approximately 40% of strikes (while trolling) result in a catch. Suppose that on a given day a fleet of fishing boats got a
Which of the following is NOT a difference between a confidence interval and a prediction interval?
When the null hypothesis for an ANOVA analysis comparing four treatment means, is rejected,
In a recent study of 35 ninth-grade students, the mean number of hours per week that they played video games was 16.6. The population standard deviation was 120 mins. Find the value of the best poin
A random variable Y has unknown mean µ and standard deviation 20. What is the sample size n needed so that the 99% margin of sampling error is 5?