Mathematics, 25.12.2019 09:31 andria89
Avariable of a population has a mean of \mu = 150 and a standard deviation of \sigma= 21 .a. the sampling distribution of the sample mean for samples of size 49 is approximately normally distributed with mean and standard deviation .b. for part (a) to be true, what assumption did you make about the distribution of the variable under consideration? a. uniform distribution. b. normal distribution. c. no assumption was made. c. is the statement in part (a) still true if the sample size is 16 instead of 49? why or why not? a. yes, the sampling distribution of the sample mean is always normal. b. no. because the distribution of the variable under consideration is not specified, a sample size of at least 30 is needed for part (a) to be true. c. no, the sampling distribution of the sample mean is never normal for sample size less than 30.
Answers: 3
Mathematics, 21.06.2019 16:30
An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.
Answers: 2
Mathematics, 21.06.2019 19:30
Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2
Answers: 1
Mathematics, 21.06.2019 21:00
Tessa bought stock in a restaurant for $253.00. her stock is now worth $333.96. what is the percentage increase of the value of tessa's stock? a.) 81% b.) 32% c.) 24% d.) 76%
Answers: 1
Mathematics, 21.06.2019 22:00
Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b.false
Answers: 1
Avariable of a population has a mean of \mu = 150 and a standard deviation of \sigma= 21 .a. the sam...
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