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The pulse rates below were recorded over a 30-second time period, both before and after a physical fitness regimen. The data is shown below for 8 randomly selected participants. Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume pulse rates are normally distributed. Test using = 0.05.
· State the null and alternate hypotheses· Calculate the mean and standard deviation· Determine which test statistic applies, and calculate it· Determine the critical value(s).· State your decision: Should the null hypothesis be rejected?
Before 52 43 31 42 40 48 34 37After 59 45 58 47 30 48 39 37
Women make up 24% of the science and engineering workforce. In a random sample of 400 science and engineering employees, what is the probability that more than 120 are women?
The ages of circulating pennies are right skewed. Most circulating pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulating pennies have a mean of 12.2 years and a standard deviation of 9.9 years.
In a study about postage tariffs and revenue, the European Economic Community wanted to look at the relationship between the number of postal employees in a country and the amount of domestic mail that was processed. They collected data for six di..
Results would be misused if wendys uses them to draw generalisation about the greater population or regard them as conclusive. Suggest and elaborate on two possible measures to glean such information.
Either no change to the Objective function or a raise in the value of the objective function depends on the constraint.
Compute the power of the previous test if the true proportion of adults having access to the internet in the population is 41%. What is the power if the true proportion is 42%? 43%?
What percent of sales representatives earn more than $42,000 per year?
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
Define probability and explain the three perspectives. Provide an example of each. Describe the difference between subjective and probabilistic sampling methods. What are the advantages and disadvantages of each?
Draw the appropriate conclusions with respect to female and male human resource manager salary levels. Calculate the t value for independent groups for the following data.
In a study of how managers attempt to manage earnings, researchers analyzed a sample of 515 earnings- management attempts from a survey of experienced auditors. The frequency of effects is summarized in the table shown. Research question: At α..
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