QUIZIZZ
You take a poll and find that 34% of the 100 people you asked dislike school lunches. Using a 95% confidence level, what is the margin of error?
.093
A survey of 280 homeless persons showed that 63 were veterans. Construct a 90% confidence interval for the proportion of homeless persons who are veterans.
.184
The mean of a population is 200 and the standard deviation is 20. What is the approximate probability of selecting 25 data values with a mean less than 190?
.6
Which z-calue is used for a 95% confident interval?
1.96
A population has a mean of 400 and a standard deviation of 40. What is the mean sampling distribution with a sample size of 25
400
the mean of a population is 200 and the standard deviation is 20. what is the approximate probability of selecting 64 data values with a mean between 195 and 200
48%
The heights (in inches) of adult males on a small Pacific Island are believed to be Normally distributed. The average height of a random sample of 25 adult makes from the island is found to be 69.72 inches. The population standard deviation is known to be 4.51 inches. A 99% confidence interval is
69.72 +- 2.32
A population has a mean of 400 and a standard deviation at 40. What is the standard error of the sampling distribution for a sample size of 25?
8
If 1757 represents "yes" voters out of 2584, construct a 95 % confidence for the voters who said "yes"
NOT .302,.338
a 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was ($139,048. $154,144). Give a practical interpretation of the interval
We are 90% confident that the mean salary of all CEOs in the electronics industry falls in the interval $139,048 to $154,144
A sample of 20 cupcakes found the interval for calories to be (150, 350). Which is the correct interpretation fo the 95% confidence interval?
We are 95% confident that the true mean calorie content in cupcakes is between 150 and 350 calories
which of the following changes to a study would result in a. narrower confidence interval?
decrease confidence, increase sample
