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The human resources department at Goldman Scahs (GS) has decided to conduct the study to find out if the different schedule kinds and the number of breaks have an effect on performance.
Determine the indicated probabilities using the geometric distribution or Poisson distribution. Then determine if the events are unusual. If convenient, use a Poisson probability table or technology
Thirty-five percent of households say they would feel secure if they had $50,000 in savings. You randomly pick eight households and ask them if they would feel secure if they had $50,000 in savings.
A quality analyst wants to develop control chart for determining whether four machines, all producing the same product, are under control with regard to a specific quality attribute.
Based upon the data, is the proportion of employees who switch plans significantly higher in 2003? Run the appropriate test at 5% level of significance.
Calculate a 95% confidence interval for the difference in the proportions of patients who left the plan within 1 year relative to their satisfaction reports.
In an effort to determine the mean annual amount spent per customer for groceries at the particular supermarket, data were collected for a sample of 100 households. The sample showed an average amou
Yielding the sample average of 17 number of service calls as well as sample variance 9. We are interesting in finding out if sample evidence contradict the vice presidents clam at significance level
When the response variable of interest is dichotomous rather than continuous, why is it not advisable to fit a standard linear regression model using the probability of success as the outcome?
A sample of TBU scores of 50 revealed a mean score of 330 with a standard deviation of 45. What is the 95% confidence interval of the mean, m, of these people? TBU scores distribute normally.
If you're performing an analysis with a single response and several potential explanatory variables, how would you decide which variable to include in a multiple regression model and which to leave
Explain how the coefficient of determination and the adjusted R (squared) can be used to help evaluate the fit of a multiple regression model to the observed data.
What assumptions do you make when using the technique of least squares to determine a population regression equation containing two or more explanatory variables?
An automatic machine in manufacturing procedure is operating properly if the lengths of significant sub component are normally distributed with mean =117 cm and standard deviation =5.2 cm.
Determine the null hypothesis? Determine the alternative hypothesis? Determine the rejections region? Determine the value of the test statistic?
A government sample survey plans to determine the blood cholesterol level of an SRS of men aged 20-34. Assume that in fact the blood cholesterol level of all men aged 20-34 follows normal distrubuti
Use the information given below to determine the P value. Also use a 0.05 significance level and state the conclusion about the null hypothesis(reject the null hypothesis or fail to reject the null
Using a table of critical t-values of the t distribution, Determine the range of values for the P-value for a two tailed test with n=15 and the test statistic t = 1.351
A simple random sample will be obtained from the normally distributed population. Determine the minimum sample size needed to be 99% confident that the sample standard deviation s is within 50% of ?
Under standard care, 10% of all patients suffering their first MI are readmitted to hospital in 6 weeks. A new protocol for care following first MI is proposed as well as evaluated. Two hundred pati
A manufacturer of medical devices has two plants and desires to compare them upon the proportion of defective items produced. In a random sample of 250 items from plant I, 28 were defective.
At a=0.05, test claim that there is no difference in proportion of men and the proportion of women who favor computer assisted instruction over lecture. Find the 95% confidence interval for the diff
In a sample of 80 Americans, 55% wished that they were rich. In sample of 90 Europeans, 45% wished that they were rich. At a=0.01, is there difference in the proportions? Determine the 99% confidenc
It has been reported in almanac that 78% of Americans own an answering machine. A random sample of 143 college professors at small liberal arts schools revealed that 100 owned an answering machine.
A current survey found that 68.6% of population own their own homes. In the random sample of 150 heads of households, 92 responded that they owned their homes. At the a=0.01 level of significance, d