Mathematics, 24.06.2019 03:00, singlegirlforlife541

In a random sample of 90 students in first grade, the mean hours of sleep per night was 9.2 with a standard deviation of 0.37 in a random sample of 70 students in the 12th grade, the mean hours of sleep per night was 7.3 with a standard deviation of 0.58. construct a 99% confidence interval for the difference between the mean hours of sleep. a. (1.82 h, 1.98 h)b. (1.79 h, 2.01 h)c. (1.74 h, 2.06 h)d. (1.69 h, 2.11 h)

Answers: 1

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 16:00, baabyylewis

Select the correct answer. in the figure, angle k measures 45°. what is the measurement of angle c? a. 38° b. 45° c. 90° d. 98°

Answers: 2

continue

Mathematics, 21.06.2019 22:10, eddiewoods8505

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

Answers: 3

continue

Mathematics, 22.06.2019 03:20, rocksac6744

Circle a has center of (2,3) and a radius of 5 and circle b has a center of (1,4) and a radius of 10. what steps will show that circle a is similar to circle b 1) dilate circle a by a scale factor of 2 2) translate circle a using the rule (x+1,y-1) 3) rotate circle a 180 degrees about the center 4) reflect circle a over the y-axis

Answers: 2

continue

Mathematics, 22.06.2019 03:30, daisyramirez2057

Mahnoor randomly selects times to walk into a local restaurant and observe the type of music being played she found that the restaurant was playing country 11 times rock & roll 17 times and blues 8 times use the observed frequencies to create a probability model for the type of music the restaurant is playing the next time mahnoor walks in.

Answers: 1

continue

Do you know the correct answer?

In a random sample of 90 students in first grade, the mean hours of sleep per night was 9.2 with a s...