Please help me answer.
2 answers:
You might be interested in
Solution
The z-score, also referred to as standard score, z-value, and normal score, among other things, is a dimensionless quantity that is used to indicate the signed, fractional, number of standard deviations by which an event is above the mean value being measured. Values above the mean have positive z-scores, while values below the mean have negative z-scores.
Mean is $650
Standard deviation = $50
Therefore the estimated percent of apartment residents = 81.86%
Answer:
And the deviation would be just the square root of the variance:
Then the statistic is given by:
And the correct option would be:
t = 1.674
Step-by-step explanation:
Data given:
represent the sample size for group 1
represent the sample size for group 2
represent the sample mean for the group 1
represent the sample mean for the group 2
represent the sample standard deviation for group 1
represent the sample standard deviation for group 2
We are assuming two independent samples from two normal distributions with equal variances we are assuming that
And the statistic is given by this formula:
Where t follows a t distribution with degrees of freedom and the pooled variance
is given by this formula:
The system of hypothesis on this case are:
Null hypothesis:
Alternative hypothesis:
The pooled variance is given by:
And the deviation would be just the square root of the variance:
Then the statistic is given by:
And the correct option would be:
t = 1.674