Answer:
And rounded up we have that n=2663
Step-by-step explanation:
Previous concepts
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
Solution to the problem
In order to find the critical value 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 99% of confidence, our significance level would be given by 
and 
. And the critical value would be given by:
The margin of error for the proportion interval is given by this formula:
(a)
And on this case we have that 
and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
We can assume an estimated proportion of 
since we don't have prior info provided. And replacing into equation (b) the values from part a we got:
And rounded up we have that n=2663
Answer:
Step-by-step explanation:
Speed of student 1 = 180/30= 6 m/sec
speed of student 2= 180/32= 5.62 m/sec
speed of student 3= 180/33= 5.45 m/sec
speed of student 4= 180/35= 5.14 m/sec
speed of student 5= 180/37= 4.86 m/sec
speed of student 6= 180/38= 4.73 m/sec
speed of student 7= 180/40= 4.5 m/sec
speed of student 8= 180/32= 4 m/sec
average speed is = (6+5.62+5.45+5.14+4.86+4.73+4.5+4)/8
hence, average speed is= 5.04
hence, the average speed of student 1 = 6m/sec
how much faster is average speed of student 1 than average speed= 6- 5.04 = 0.96
hence, average speed of student 1 is 0.96 m/sec more thanthe average speed.
Answer:
A) Cross-sectional
Step-by-step explanation:
A cross-sectional study is a type of study that involves the data i.e. taken from a population for a specific time period.
Here study shows the peoples interest in variables that are be chosen
In the given situation, since a town obtains a data of the current employment for 10,000 of its total citizens
So this represents the cross-sectional
hence, the correct option is A.
Cross-sectional
Answer:
n < -10
Step-by-step explanation:
