Agroup of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. they sampled 240 students and found a mean of 22.3 hours per week. assuming a population standard deviation of six hours, what is the confidence interval at the 95% level of confidence? ( use student's t distribution (appendix b.5) at infinite degrees of freedom for three decimal accuracy of the required z value.)

Step-by-step explanation:

The confidence interval for population mean is given by :-

Given : Sample size : , which is a large sample , so we apply z-test .

Sample mean :

Standard deviation :

Significance level :

Critical value :

Now, a confidence interval at the 95% level of confidence will be :-

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

the option best identifies the textual evidence that supports this conclusion is c.) when an argument is over, how many weighty reasons does a man recollect which his heat and violence made him utterly forget? in order to recognize textual evidence is to identify the topic sentence where the author states the main idea. textual evidence is what supports the topic sentence or main idea of a passage.