A poll conducted the day before the student-body presidential election at a Midwestern university showed that 53 percent favored Mario, the rest favoring Yin Ling. The margin of error was 5 percentage points. A) Find the confidence interval of Mario. B) Should Yin Ling have conceded the election? (HINT : Mean +/- Margin of Error)

(A) The confidence interval for the proportion of students who favored Mario is (48%, 58%).

(B) Yin Ling should not concede the election.

Step-by-step explanation:

The (1 - α)% confidence interval for the population proportion is:

The proportion of students who favored Mario is, .

The margin of error is, MOE = 0.05.

(A)

Compute the confidence interval for the proportion of students who favored Mario as follows:

Thus, the confidence interval for the proportion of students who favored Mario is (48%, 58%).

(B)

The confidence interval for Mario shows that 48% to 58% people are expected to favor Mario.

Since the lower limit is 48% there is still a chance that Yin Ling could win the election if only 48% students favor Mario.

So, Yin Ling should not concede the election.

21.4 i did it already for s1

step-by-step explanation:

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2