Mathematics, 21.04.2020 01:00 chairawks
It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college students got less than the recommended number of hours of sleep each night, on average. The researcher randomly sampled 20 college students and calculated a sample mean of 7.5 hours per night. If the researcher wanted to perform a one-sample t-test, which of the following is a correct statement?
A: By taking a random sample, the researcher has guaranteed that the distribution of number of hours of sleep per night for all college students is normal.
B. The number of hours of sleep per night for all college students must be normally distributed because the sample size is small.
C. By taking a random sample, the researcher has guaranteed that the distribution of sample means is normal.
D. The distribution of sample means will be normal even if the distribution of the data in the population is not normal.
Answers: 1
Mathematics, 21.06.2019 15:00
Three coins are flipped. what is the probability that there will be at least two tails?
Answers: 1
Mathematics, 21.06.2019 22:30
An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount
Answers: 1
Mathematics, 22.06.2019 01:00
You have just applied, and have been approved for a $58,000 mortgage. the rate quoted to you by the lender is 6.1% for a 30 year fixed mortgage. determine how much of your third month’s payment goes towards the principal. $56.65 $56.93 $57.22 $57.51
Answers: 2
Mathematics, 22.06.2019 02:00
Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is
Answers: 2
It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college stu...
Mathematics, 16.07.2020 19:01
Mathematics, 16.07.2020 19:01
Mathematics, 16.07.2020 19:01
Computers and Technology, 16.07.2020 19:01
Computers and Technology, 16.07.2020 19:01