ALL ABOUT STAT

Question 1 of 15 1 Point Fil in the blanks The secretary in a statistics department would like to estimate how much coffee to brew per day such that there is enough fresh coffee for the consumers in the department She decides to take a random sample of 10 of the coffee drinkers in the department and asks them to indicate the number of cups of coffee they consume per day when they are in the department. The results of her study are given: 3, 4, 4, 6, 4, 6, 5, 2, 5, and 3, The sample mean (exact) is The sample standard deviation (round the answer to 3 decimal places) is The 99 percent confidence interval for the average number of cups of coffee consumed per day by the consumers in this department is cups to cups (round the answer to 3 decimal places)Question 2 of 15 1 Point Fill in the blanks Suppose that the heights of the population of basketball players at a certain college are normally distributed with a standard deviation of 2 feet If a sample of heights of size 16.is randomly selected from this population with a mean of 6.2 feet, the 95 percent confidence interval for the mean height of these basketball players is feet to feet (round your answer to 2 decimal places)Question 3 of 15 1 Po When considering sampling distributions, if the sampling population is normally distributed, then the distribution of the sample means Select the correct response O none of the above. will be approximately normally distributed will be exactly normally distributed. will have a discrete distribution.Question 4 of 15 The concept of sampling distribution applies to Select the correct response Ofonly continuous probability distributions from which random samples are obtained. only discrete probability distributions from which random samples are obtained any probability distribution from which random samples are obtained only the normal probability distributionQuestion 5 of 15 The maximum error of estimate gives a measure of accuracy when computing the sample size required to make inferences. Select the correct response True FalseQuestion 6 of 15 1 Po If we change the confidence level from 98 to 95 percent when constructing a confidence interval for the population mean, we can expect the size of the interval to Select the correct response stay the same none of the above decrease increaseQuestion 7 of 15 I Point Fil in the blanks Complete the following and construct a 90 percent confidence interval for the population mean u given the following random sample of numbers. 8, 10, 20, 18. Sample Mean (exact) Sample Standard Deviation (round off to 3 decimals): Confidence interval (round off to 2 decimals)