Answer:
Taking square root in both sides we got the interval desired
Step-by-step explanation:
Information provided
s=7.2 represent the sample standard deviation
represent the sample mean
n=50 the sample size
Confidence=97% or 0.97
The confidence interval
We can use the following formula for the confidence interval for the true variance
The degrees of freedom are given by:
The confidence level is 0.97 or 97%, the significance and and the critical values are:
The excel commands would be: "=CHISQ.INV(0.015,49)" "=CHISQ.INV(0.985,49)". so for this case the critical values are:
Replacing the values we have:
Taking square root in both sides we got the interval desired
Answer:
C
Step-by-step explanation:
The x-axis is more than 7.0 and the y-axis is less than 7.0.
Cheers
Answer:
5
Step-by-step explanation:
Answer:
Step-by-step explanation:
Notation and definitions
random sample taken
estimated proportion of adults in the sample reported that television was their preferred method
true population proportion of adults in the sample reported that television was their preferred method
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The population proportion have the following distribution
In order to find the critical values we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by and . And the critical values would be given by:
The margin of error for the proportion interval is given by this formula:
(a)
And if we replace the values we got:
Answer:
John starts with $12 dollars in his bank account, each day he spends $3.
Step-by-step explanation: