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Suppose that an event A contains 10 observations and event B contains 15 observations. If intersection of events A and B contains exactly three observations, ho
In sampling without replacement from the population of 900, it's found that standard error of mean, σx_ (sigmax bar), is only two-thirds as large as it would've been if the population were infin
In simple random sample from population that's approximately normally distributed, the following data values were gathered.
For 1996, U.S. Department of Agriculture has estimated that American consumers would've eaten, on average, 2.6 pounds of cottage cheese during the course of that year. We can conclude that average c
Describe the logic of what you've done, writing as if you were speaking to someone who has never had the statistics course, but who does understand mean, standard deviation, and Z scores.
You're the manager of restaurant which delivers pizza to college dormitory rooms. Using the 6-step critical value approach, at the 0.05 level of significance, is there evidence that the population m
A manufacturer of chocolate candies employs machines to package candies as they move along the filling line. Find out the p-value and interpret its meaning. Is there evidence that population mean amou
At the 0.01 level of significance, is there evidence that the mean price is higher at the Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (a). What assumption is
The retailing manager of a supermarket chain wants to determine whether product situation has any effect on the sale of pet toys. What should the retailing manager conclude? Describe the retailing ma
A vice president for marketing recruits 20 college graduates for the management training. The 20 individuals are randomly alloacted, 10 each, to one of two groups. Is there evidence of a difference
Find out a 95% confidence interval for true population proportion of voters who favor such a tax. Find out a 99% confidence interval for true population proportion of voters who favor such a tax.
Make a 99 percent confidence interval for mean daily intake of milk. You might suppose the daily intake amounts are normally distributed.
Make the 90% confidence interval for mean score of all such subjects. You might suppose the scores are normally distributed.
The sample has a mean weight of 15.3 pounds and standard deviation of 1.9 pounds. Make a 95% confidence interval estimate for true mean weight of all packages received by parcel service.
You will first require to find out the sample mean and sample standard deviation based on confidence interval given. Employ the value you found in part a to determine the degree of confidence for inte
According to a recent poll, 16.2% of credit cardholders in United States shave employed their credit card to make a purchase on internet. You will be asked to recognize how large a sample must be ta
In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in security and safety-related jobs, and found that 1,143 were positive. Make a 95 percent confiden
Describe the major points of the Central Limit Theorem for mean. Why is population shape of concern when estimating the mean? What does sample size have to do with it?
How many measurements must be made in order to be 99% certain that the maximum error of estimation will not exceed one second? What sample size is needed for maximum error of two seconds?
Find out a sample mean which produced this p-value given that sample of size n = 50 was randomly selected.
In order to conduct the Experimental, four subjects are randomly selected from the group of 20 subjects. How many different groups of four subjects are possible?
In the certain state, each automobile license plate number includes two letters followed by the four-digit number. How many distinct license plate numbers can be formed when
The mean of the random variable represents the " theortical average" of the probability experiment and sometimes isn't a possible outcome.
The sociologist surveyed households in aneighboring town. The random variable x represents the number of dependent children in house holds.
A company recorded the number of phone lines in use per hour throughout one work day. The random variable x represents the number of phone lines in use.