Answer:
1st and 3rd
Step-by-step explanation:
u welcome :)
Answer:
B) The sample size was 100
Step-by-step explanation:
Number of sample size in January = 100
Number of sample size in March = 100
Number of sample size in June = 100
Number of sample size in September = 100
The average sample size for the study = (100 +100+100+100)/4
= 400/4
= 100
So the average sample size for the study is 100 women between 18 to 21 years.
Answer:
Approximately, the 90% confidence interval for the students' mean IQ score is between 129.045 - 130.956
Step-by-step explanation:
The formula to use to solve this question is called the Confidence Interval formula.
Confidence interval =
x ± z × ( σ/ (√n) )
Where:
x = the sample mean = 130
z = the z-value for 90% confidence = 1.645
σ = standard deviation = 7
n = sample size = 145
130 ± 1.645 × (7/√145)
130 ± 0.9562687005
130 - 0.9562687005 = 129.0437313
130 + 0.9562687005 = 130.9562687005
Therefore, approximately, the 90% confidence interval for the students' mean IQ score is between 129.045 - 130.956
I would say the answer is C as it is the most unbiased, and considers everyone in the residential area, rather than just dog owners or just residents who do not own pets.
What are you asking about the equation? :3