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On a multiple choice test with 11 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the number of correct answers.
A)1.407
B)1.436
C)1.369
D)1.342
The average public elementary school has 450 students. assume the stand deviation of the distribution is 99. if a random sample of 36 public elementary schools is selected, find the probability that the number of students enrolled is between 445 a..
Given this Analysis of Variance information for three treatments each with six observations.with SST =1116, SSE=1068, SSTotal =2184. What is the mean square for treatments?
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
A recent article in the Denver Post indicated that the mean selling price of the homes in the area is more than $220,000. Can we conclude that the mean selling price in the Denver area is more than $220,000? Use the .01 significance level. What is..
Given that x is a normal variable with mean u = 47 and standard deviation = 6.2, find:
What hypothesis testing model (my “models” handout) would be used under each of the following conditions. Use the “model number” from my handout if you wish. By line the information given in each cell is: Level of measurement, number of groups, sampl..
In a shipment of 52 vials, only 12 do not have hairline cracks. If you randomly select 2 vials from the shipment, what is the probability that none of the 2 vials have hairline cracks?
The manufacturer would like to establish Inventory levels such that there is only a 5% chance of running out of stock. Where the Manufacturer should set the inventory levels?
An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is know to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000.
An HMO is considering a marketing plan targeting patients with chronic diseases to increase the number getting a flu shot. Some preliminary analyses are conducted before implementing such a plan.
Of those mountain climbers who attempt Mt. McKinley, only 65% reach the summit.In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley, what is the probability of each of the following?
Use the binomial distribution formula to calculate the probability that:
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