Mathematics, 21.02.2021 14:00 bakoeboo
The lengths of text messages are normally distributed with a population standard deviation of 6 characters and an unknown population mean. If a random sample of 27 text messages is taken and results in a sample mean of 25 characters, find a 95% confidence interval for the population mean. Round your answers to two decimal places.
Answers: 2
Mathematics, 21.06.2019 20:30
3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.
Answers: 1
Mathematics, 22.06.2019 02:30
Solve the compound inequality. graph your solution. 2x β 2 < β12 or 2x + 3 > 7 x < β5 or x > 5 x < β5 or x > 2 x < β12 or x > 2 x < β7 or x > 5
Answers: 2
Mathematics, 22.06.2019 03:00
Select quivalent or not equivalent to indicate whether the expression above is equivalent or not equivalent to the values or expressions in the last column.
Answers: 3
The lengths of text messages are normally distributed with a population standard deviation of 6 char...
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