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As a result of these findings, he asks the following question: Do students differ in terms of the points they earn in the course based on race and delivery environment?
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution. Use alpha =.05 and .01 and perform
A manufacturer claims that fewer than 6% of its fax machines are defective. In a random sample of 97 such fax machines, 4% are defective. Find the P-value for a test of the manufacturer's claim.
The service rate is 1 customer every 45 seconds, find the average queue size, the average waiting time, and utilization rate? Assume an M/M/1 process.
In a certain college, 20% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, what is the probability that exactly 2 belong to an ethnic
A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion
These six students are then given a retest. Is there sufficient evidence at the 0.05 level of significance that the refresher class helped? Assume that the variable is normally distributed.
54% of men consider themselves professional baseball fans. You randomly select 10 men and ask if he considers himself a fan. Find the probability that the number who consider themselves professional
Based on the sample statistics obtained below, is there sufficient evidence to conclude a difference in average television watching times between the two groups?
The average number of calories in a small chocolate bar is 225. Suppose that the distribution of calories is approximately normal with 10. Find the probability that a randomly selected chocolate bar
The average time it takes a person in a one-person canoe to complete a certain river course is 47 minutes. Does the confidence interval interpretation agree with the results of the hypothesis test? Ex
You are receiving a trip to Europe as a graduation gift. The final destination is a surprise. You have only been to been told that you starting point is London and that you will be arriving there on
In Cleveland, a sample of 73 mail carriers showed that 10 had been bitten by an animal during one week. Find the 95% confidence interval for the difference of the two proportions.
what is the probability of selecting a sample mean of 7 or less , with a sample population of 9 and mean of 10 and a standard deviation of 3
Is there sufficient evidence at the 0.05 level of significance that the refresher class helped? Assume that the variable is normally distributed.
. A city monitors ozone levels daily over a 3 year period in order to relate the ozone levels to the seasons. Determine whether the experiment is observational or designed.
In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket. Identify the dependent (response) variable for this experiment.
At , decide if there is enough evidence to reject the claim of no difference in the ages of the two groups. Compute and use the standard deviations from the samples.
the attitude of each trainee was measured on a 100-pt. scale (the lower the score, the poorer the attitude). How many treatments are in this experiment?
The number of ounces of soda in each bottle is given below. At , can we reject the claim that the machine is functioning properly? Assume that the variable is normally distributed.
A food snack manufacaturer samples 11 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% con
Is there sufficient evidence at the 0.05 level of significance to conclude that the proportion of women physicians at the university health system exceeds 33.7%?
A president surveys 28 randomly selected families and finds that their average income is $88,500. If the sample standard deviation is $10,000, can the president conclude that there is a difference?
Use mehtods of descriptive statistics to summarize the data. Comment on the findings. Develop an estimated regression equation that can be used to predict WinPct using all the data provided.