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1. A factory arranges different portions of its assembly lines in an attempt to insure that all jobs take an equal amount of time for completion. Periodically they check these completion times by conducting independent surveys. The A Line was sampled 30 times and showed an average completion time of 20 minutes with a standard deviation of 2.5 minutes. The B Line was sampled 35 times and showed an average completion time of 26.5 minutes with a standard deviation of 1.6 minutes. At the ninety five percent confidence level, does this data support the belief that both routes in the city take an equal time to complete? Conduct a hypothesis test to determine if this assumption is correct.
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?
Petitions. To get a voter initiative on a state ballot, petitions that contain at least 250,000 valid voter signatures must be filed with the Elections.
People with type O-negative blood are universal donors. That is, any patient can receive a transfusion of O-negative blood. Only 7% of the American population have O-negative blood.
At a .05 level of significance, is there evidence of a relationship between financial condition and education level?
One of the most famous probability calculations is called the "birthday problem". In probability theory, the birthday problem or birthday paradox concerns the probability that, in a set of n randomly chosen people
Which of the following statements is true regarding a nonparametric test?
An understanding of statistics is necessary for any job. The use of statistics can help provide answers to many questions. Please, post a question you think that statistics may help you answer and explain why statistics can contribute to providin..
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concer..
Criticize the following definitions in light of the eight rules for lexical definitions:- A symphony is a musical piece written for full orchestra.
Is the normality assumption that was made at the beginning valid? Why or why not? Hint: Does this distribution have the properties of a normal distribution as described in the course textbook
in an october 2012 survey of 7786 randomly selected adults living in germany 5840 said they exercised for at least 30
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