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3 years ago

QUESTION 8 PART B C AND D, PLEASE DO ALL OF THEM I WILL MARK BRAINIST!!!

Mathematics

2 answers:

klemol [59]3 years ago

5 0

Answer:

223

Step-by-step explanation:

juin [17]3 years ago

4 0

1: (-2,7)
2: (1,0)
3: her elevation was 3 because that's the y value on the graph
4: her elevation decreased because the line on the graph has a negative y slope as x gets larger

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3 years ago

The life in hours of a biomedical device under development in the laboratory is known to be approximately normally distributed.

bearhunter [10]

Answer:

Kindly check explanation

Step-by-step explanation:

H0 : μ = 5500

H1 : μ > 5500

The test statistic assume normal distribution :

Test statistic :

(Xbar - μ) ÷ s/sqrt(n)

(5625.1 - 5500) ÷ 226.1/sqrt(15) = 2.1429 = 2.143

Pvalue from test statistic :

The Pvalue obtained using the calculator at df = 15 - 1 = 14 is 0.025083

α = 0.05

Since ;

Pvalue < α

0.025083 < 0.05 ; Reject H0

The confidence interval :

Xbar ± Tcritical * s/sqrt(n)

Tcritical at 95% = 1.761 ;

margin of error = 1.761 * 226.1/sqrt(15) = 102.805

Lower boundary : (5625.1 - 102.805) = 5522.295

(5522.295 ; ∞)

The hypothesized mean does not occur within the constructed confidence boundary. HENCE, there is significant eveidbce to support the claim that the true mean life of a biomedical device is greater than 5500

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3 years ago