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The annual sales of playground equipment follow the normal distribution. However, the mean and standard deviation are unknown. 40% of the time sales are more than 470,000 and 10% of the time sales
The organization collected demographic information: gender, age, type of training (professional, paraprofessional, or nonprofessional), location of the worksite (on-site or off-site) and years of ex
Suppose the following summary statistics are obtained from a large group of individuals: _ X=52.0, Sx=8.7, Y=147.3, Sy=16.9. Dorothy receives an X score of 52. What is her predicted Y score if:
Compute the summary statistics required for determining the regression equation for predicting principal ratings from teacher certification test scores.
The relatives of a man recently diagnosed with Alzhcimers disease are suing a company that sells drinks in aluminum cans claiming damages.
The Charlevoix Seismic Zone (CSZ) is the most seismically strive region of eastern Canada. Earthquakes of magnitude 6.0 and over occurred in 1663; 1791; 1860; 1870; and 1925 These large quakes ther
Bombardier designs and manufactures trains and planes and relies on large deals from its customers for these high cost products. This series of large contracts makes for a very variable revenue str
In 2011, Nina Gupta, an analyst, predicts that Bombardier's service share will drop to 13% with a standard deviation of 1% in 2014 and that Rolls-Royce's service share will increase to 54% with a st
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Choose an appropriate level of significance.
A sample of 120 observations revealed that = .30. At the .05 significance level, can the null hypothesis be rejected? a. State the decision rule. b. Compute the value of the test statistic
At the .025 level, has Holdlonger increased the shelf life of the chlorine? Determine or estimate the p-value.
For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Using the .01 significance rule. What is your decision regarding the null hypothesis?
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.
The sample mean is 12 for the sample of 36. The population standard deviation is 3. Use the .02 significance level. What is the decision rule?
For the past three years, an insurance company has stated that its average claim amount is $2000. The manager feels that this amount should be updated and takes a sample of 55 claims to see if the
For each of the following, state the null hypothesis and the alternative hypothesis.
What was the explanatory variable? The explanatory variable is the number of students taking a first year seminar course for pre-health professional majors.
In developing a regression equation from the following data to predict y by x, the y intercept is:
Is it reasonable to conclude that the mean weekly salary of nurses is higher? Use the .01 significance level. What is the p-value? Interpret the p-value.
A sample of 200 observations from the first population indicated that X1 is 170. A sample of 150 observations from the second population revealed X2 to be 110. Use the .05 significance level to tes
A sample of 50 observations is selected from a second population with a population standard deviation of 0.66. The sample mean is 2.59. Conduct the following test of hypothesis using the .08 signif
A sample of 200 observations from the first population indicated that X1 is 170. A sample of 150 observations from the second population revealed X2 to be 110. Use the .05 significance level to test
Among drivers who drive daily about 40% have gotten a speeding tickets at one point or another. There is a statistics class of 80 students and 10 of them can actually drive every day. Using this inf
Reported crimes are believed to occur at random at different rates for different types of crime. the incidence rate for a particular type of crime in city B is 3.0 per week.