Mathematics
Mathematics, 28.07.2019 12:00, pg67891012345

Consider a set of data in which the sample mean is 26.9 and the sample standard deviation is 7. calculate the z-score given x=29.4

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Mathematics, 22.06.2019 04:40, kdobi
This assignment is past the original due date o this data is from a sample. calculate the mean, standard deviation, and variance 16.7 11.1 46.7 14.8 13.3 16.6 18.5 47.3 42,8 show the following answers to 2 decimal places. sample mean- sample standard deviation ( use the standard deviation above for your calculation.) sample variance ooops- now you discover that the data was actually from a population! so now you must give the population standard deviation.
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World Languages, 08.07.2019 10:00, nsjcbdhcb
1415*98+6+7655 a machine produces metal rods used in an automobile suspension system. a random sample of 15 rods is selected and the diameter is measured. the resulting data (in millimeters) are as follows: no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 dia. 8.21 8.19 8.23 8.25 8.26 8.23 8.20 8.26 8.19 8.23 8.20 8.28 8.24 8.25 8.24 use the data above to calculate a 95% two-sided confidence interval on the mean rod diameter. assume the data are normally distributed. (a) calculate the sample mean and standard deviation. round the sample mean and the sample standard deviation to 2 and 3 decimal places respectively (e.g. 98.76 and 98.765).
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Mathematics, 27.07.2019 07:00, andaws21
Amachine produces metal rods used in an automobile suspension system. a random sample of 15 rods is selected and the diameter is measured. the resulting data (in millimeters) are as follows: no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 dia. 8.21 8.19 8.23 8.25 8.26 8.23 8.20 8.26 8.19 8.23 8.20 8.28 8.24 8.25 8.24 use the data above to calculate a 95% two-sided confidence interval on the mean rod diameter. assume the data are normally distributed. (a) calculate the sample mean and standard deviation. round the sample mean and the sample standard deviation to 2 and 3 decimal places respectively (e.g. 98.76 and 98.765).
Answers: 1
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Mathematics, 12.09.2019 19:20, Joshghopper
We suspect that, on average, students will score higher on their second attempt at the sat mathematics exam than their first attempt. here are the results for 46 randomly chosen high school students: -0|176655 -0|144422 0l11222333 0|1555666789 1|100223 1. should we use a z-test or a t-test on this data? why? a. a z-test because the population standard deviation is unknown, but we have the data to calculate the sample standard deviation b. a z-test because we know the value of the population standard deviation c. a t-test because the population standard deviation is unknown, but we have the data to calculate the sample standard deviation d. a t-test because we know the value of the population standard deviation 2. can we say that the condition of "normality of the population" is met? why or why not? a. yes, because the plot has no extreme outliers b. no, because the sample size is too small to apply the central limit theorem c. yes, because the population of change in scores in normal d. no, because we do not know if the population of change in scores is normal
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