Question

- A researcher wants to test if a new caffeinated drink would significantly extend people’s circadian rhythm (biological clock) beyond 24 hours. The researcher takes a sample of individuals (N = 30) and gives them the new caffeinated drink for daily consumption. The researcher then measures these participants’ circadian rhythm (M = 24.6 hours; s = 2.2).

(a) Calculate the 95% confidence interval for the sample.

(b) If you were to use the 95% CI to test the hypothesis “if the new caffeinated drink extends people’s circadian rhythm beyond 24 hours”, what would your conclusion be?

Answer #1

1. A social researcher wants to test the hypothesis that people
who drink a lot while bowling have higher scores than people who do
not drink while they bowl. The researcher studies 50 drinking
bowlers and 50 non-drinking bowlers. The average score for drinking
bowlers was 142 with a standard deviation of 7.45. The average
score for non-drinking bowlers was 134 with a standard deviation of
6.81.
In words: What are your conclusions about the null
hypothesis?
2. A social...

A medical researcher would like to determine how effective a new
form of knee surgery is for
treating knee pains. (In particular, is there a relationship
between surgery status and pain
reduction status?) He gathers 500 people with knee pain who are
scheduled to have this
surgery, and 500 people with knee pain who are not scheduled to
have this surgery. He follows
up with both groups after 2 months and determines the number of
participants of each group
who...

Question 6
An investigator is looking at the relationship between
periodontal disease and the onset of hypertension. Suppose the
investigator decides to look at height as a variable that may
confound the relationship between exposure and case status in his
study. After collecting information about the height of each
participant, he assembles a database that approximates height with
the normal distribution.
A) Assuming the mean of the distribution is 176.2 cm with a
standard deviation of 17.5 cm, what are...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 19 minutes ago

asked 30 minutes ago

asked 31 minutes ago

asked 31 minutes ago

asked 33 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago