Hat z-score is used for a 99% confidence interval to estimate a population proportion? (skip the z-table, get one more decimal place of accuracy from the notes, your calculator, or click this online calculator.) Use 3 decimal places in your answer. (b) What z-score is used for a 94% confidence interval? Round your answer to 2 decimal places. (c) What z-score is used for a 93% confidence interval? Round your answer to 2 decimal places.

(a) z-score for 99% confidence interval = 2.575

(b) z-score for 94% confidence interval = 1.88

(b) z-score for 93% confidence interval = 1.81

Step-by-step explanation:

Confidence Interval:

The confidence interval indicates the level of confidence that the true parameter lies in the proposed range.

(a) What z-score is used for a 99% confidence interval to estimate a population proportion? Use 3 decimal places in your answer.

z-score for 99% confidence interval = 2.575

(b) What z-score is used for a 94% confidence interval? Round your answer to 2 decimal places.

z-score for 94% confidence interval = 1.88

(c) What z-score is used for a 93% confidence interval? Round your answer to 2 decimal places.

z-score for 93% confidence interval = 1.81

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

i think it will be zero as slope has a formula of difference between initial and final distance divided by itz time interval