"a survey reports the percentage of people 18 years of age and older who smoke. suppose that a study designed to collect new data on smokers an dnonsmokers uses a preliminary estimate of the proportion that smoke of 0.3. how large a sample should be taken to know with 95% confidence the proportion of smokers within a 0.02 true population proportion"

2017

Step-by-step explanation:

Given : The proportion of people that smoke : p=0.3

Margin of error : E= 0.02

Significance level :

Critical value :

The formula to calculate sample size ( if proportion is known) :-

Hence, the required minimum sample would be 2017.

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x