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Is this a: simple random, samplestratified sample, systematic samplecluster sample or convenience sample?
Thirteen percent of the adult population is left-handed. Of the first 44 presidents of the United States, seven are left-handed. Is there evidence that the presidents represent a biased sample of th
A professor has written 6 different versions of an online test, for security reasons. Students are randomly assigned any one of the tests when they sign in to take it.
Police response time to an emergency call is the difference between the times the call is first received by the dispatcher and the time a patrol car radios that it has arrived at the scene. over a l
Five years ago the standard deviation of the ages of the undergraduate business students was 1.5 years. Recently a sample of 26 such students had a standard deviation of 2.0 years. We are interested
We are interested in testing whether the standard deviation of a population 1 is significantly greater than the standard deviation of population 2, at a 5% significance level. The sample sizes are:
At a 0.01 significance level can we conclude that the mean speed of all vehicles at this location is greater than 65 miles per hour? Assume a population standard deviation of 7.8 miles per hour. Wh
Sarah takes a random sample of 50 girls at her high school and finds the average number of text messages is 106. Do you think the average number of text messages girls send at sarah's high school is
What results in your departments seem to be correlated or related to other activities? How could you verify this? Create a null and alternate hypothesis for one of these issues. What are the manager
When one variable precedes the other in time and the correlation between them is high, which statement can be made with confidence?
X is a normally distributed random variable with a mean of 5.0. Find the standard deviation of the distribution if 59.10% of the data lies to the right of 4.54.
One way to establish validity of a questionnaire is my measuring:
Which statement is true about descriptive studies?
Assume the car can be purchased for 0% down for 60 months (in lieu of rebate). A car with a sticker price of $42,050 with factory and dealer rebates of $5,100 (a) Find the monthly payment if finance
Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 5% compounde
Defects in computer hard-drives will usually render the entire computer worthless. For a particular model, the percent defective in the past has been 1%. If a sample size of 400 is taken, what would
Find the approximate value of z that gives an area of 0.025 to the right of it. Round your answer to the nearest hundredth.
Information from a university's website states that 55.6% of its students are female. For a research project, a graduate student selects a simple random sample of 400 the university's students. Des
At a local fast-food joint, cars arrive randomly at a rate of 12 every 30 minutes. It takes an average of 2 minutes to serve each arrival. The utilization factor for this system is:
What is the probability of getting a license plate that has a repeated letter or digit if you live in a state in which license plates have one numeral followed by three letters followed by three num
The breaking strength of threads has a standard deviation of 18 grams. How many measures on breaking strength should be used in the next experiment if the estimate of the mean breaking strength is t
For a random sample of 50 measurements on the breaking strength of cotton threads, the mean breaking strength was found to be 210 grams and the standard deviation 18 grams. Obtain a confidence inter
The thermistors are to be sorted with those having resistances between 8000 and 15,000 ohms being shipped to a vendor. What fraction of these thermistors will be shipped?
The selection of a proper seller is critical to the success of a project. All of the below would be considered good selection criteria fo a buyer to use to select a seller, except
Suppose you are conducting a study with a total of 50 participants from five different regions of the country, and you want to determine if the average blood pressure is different among these groups