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Sagot :
Answer:
H0: μ ≥ 266
H1 : μ < 266
Yes, condition for Ztest have been met.
-1.975
Step-by-step explanation:
Given that:
μ = 266
Sample size, n = 25
Sample mean, x = 259.68
The Null hypothesis, H0: μ ≥ 266
The Alternative hypothesis, H1 : μ < 266
The test statistic, :
(x - μ) ÷ (s/sqrt(n)
(259.68 - 266) ÷ (16/sqrt(25))
−6.32 / 3.2
= - 1.975
Using the Pvalue from Zstatistic calculator :
Pvalue, one tail test at 0.05, Zscore = - 1.975
Pvalue = 0.024134
Since ;
Pvalue < α ; reject Null
0.024 < 0.05 ;
The is significant evidence to support the claim that women who smoke during their pregnancy have shorter pregnancy than general women.
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