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topjm [15]
3 years ago
15

What does diagonal DB equal?• 4• 3• 6• 7​

Mathematics
1 answer:
dimaraw [331]3 years ago
4 0

Answer:

<h2>|DB| = 6</h2>

Step-by-step explanation:

If ABCD is a rhombus then the diagonals AC and BD are perpendicular and intersect in half.

Let E be the point of intersection of the diagonals.

Therefore:

AE ≅ EC and DE ≅ EB ⇒ |AE| = |EC| and |DE| = |EB|.

DB = DE + EB

|EB| = 3 ⇒ |DB| = 3 + 3 = 6

ABCD it's not a rectangle because in each rectangle diagonals are congruent and intersect in half.

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in 1991, a gallup poll reported this percent to be 79%. using the data from this poll, test the claim that the percent of driver
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We reject our null hypothesis, H₀, at a level of significance of =0.01 since the P-value is less than that threshold. There is compelling statistical data to indicate that since 1991, the proportion of drivers who love driving has decreased.

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The Pew Research Center recently polled n=1048 U.S. drivers and found that 69% enjoyed driving their automobiles.

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To report the large-sample z statistic and its p-value,

Null hypothesis,

H₀ : p = 0.79

Alternative hypothesis,

Ha : p < 0.79

Level of significance, α = 0.01

Under H₀

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Z₀ = -7.948

The alternative hypothesis(Ha) is left-tailed, so the P-value of the test is given by

P-value = P(z <-7.945)

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Since the P-value is smaller than given level of significance, α=0.01 we reject our null hypothesis, H₀, at α=0.0.1 level Strong statistical evidence to conclude that the percentage of drivers who enjoy driving their cars has declined since 1991.

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1 year ago
Chandra runs 10 miles. After every two miles, she checks the time. The scatter plot shows her results.
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3 0
3 years ago
A savings and loan association needs information concerning the checking account balances of its local customers. A random sampl
Marina86 [1]

Answer:

The 99% confidence interval for the true mean checking account balance for local customers is ($439.29, $888.99).

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 14 - 1 = 13

99% confidence interval

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The margin of error is:

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The 99% confidence interval for the true mean checking account balance for local customers is ($439.29, $888.99).

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3 years ago
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