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For population with mean of m = 100 and standard deviation of s = 10. Find out the score (X values) which corresponds to each of following z-scores.
Explain the distribution of sample means (shape, Expected value, and standard error) for samples of n=36 chosen from the population with mean of m =100 and standard deviation of s=12.
How likely is it to obtain the random sample of n=16 jurors with the average age greater than or equal to 48.9 Is it reasonable to conclude that this set of n=16 people isn't a representative random s
For the population with mean of µ=60 and standard deviation of s=24. Find out the z score corresponding to each of following samples.
The value of z score in a hypothesis test is affected by variety of factors. Supposing that all other variables are held constant, describe how the value of z is affected by each of the following:
Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds' behavior? Use a two-tailed test with a = 0.05.
A researcher would to analyze the effects of humidity on eating behaviour. It is known that laboratory rats normally eat the average of m = 21 grams of food each day.
The AMI Company has 2 assembly lines in its Kansas City plant. Line A produces the average of 335 units per day with the standard deviation equal to 11 units. Line B produces the average of 145 unit
The State Department of Weights and Measures is liable for making sure that commercial weighing and measuring devices, such as scales, are accurate so customers and businesses aren't cheated.
A major tire manufacturer wishes to estimate mean tread life in miles for one of their tires. They want to develop the confidence interval estimate that would've the maximum sampling error of 500 mi
Conduct the hypothesis test using 0.05 level of significance and determine whether or not the company's claim is supported.
Woody is interested in estimating if workers are more concerned with the job security or pay. He gains the cooperation of 30 individuals who work in different settings and ask each employee to rate
Based upon this sample, is Moe correct in his assertion? Write down the formal commentary of results of your test (similar to the phrasing found in Cronk textbook).
An auditor wishes to estimate what proportion of bank's commercial loan files are incomplete. The auditor randomly samples 100 files and finds out 9 are incomplete.
A business wants to estimate true mean annual income of its customers. The business needs to be in $500 of true mean.
An auditor wants to estimate what proportion of bank's commercial loan files is incomplete. The auditor wants to be in 4% of true proportion when using the 95% confidence level.
A business wants to estimate true mean annual income of its customers. It randomly samples 200 of its customers. The mean annual income was the $52,500 with standard deviation of $1,800.
There are many manners to produce crooked dice. To load a die so that six comes up too often and 1 (which is opposite 6) comes up too seldom, add the bit of lead to the filling of spot on the 1 face
The scores of high school seniors on ACT college entrance examination in the 2003 has mean = 20.8 and standard deviation = 4.8. The distribution of scores is only roughly normal.
A $1.00 bet is a state lottery's pick 3 game pays $500 if the three-digit number you select exactly matches the winning number, which is drawn at random. Here is distribution of payoff X:
Seven coloured balls are placed in bucket :3 blue, 2 red, and 2 green and one ball is randomly sampled, then set aside. Then a second ball is randomly chosen What is
A carnival game costs $2 to play. The player first flips the coin, then rolls the pair of dice, to win the player must get the head outcome followed by a"7" outcome on dice. If the game is fai
Many economics students are unprepared for multiple-choice quiz with 25 questions, and all of their answers are guesses. Each question has 5 possible answers, and only one of them is correct.
Atest comprises multiple- choice questions each having 4 possible answers (a,b,c,d) one of which is correct. Suppose that you guess the answers to 6 such questions.
To compute weighted aggregate price index using Laspeyres and Paasche method.