Alex is making string bracelets for his friends he has 5 meters of string to make each bracelet. How many bracelets can Alex mak
2 answers:
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Answer:
Yes it appropriate to use the normal approximation to find the probability that more than 43% of the people in the sample have high blood pressure
Step-by-step explanation:
From the question we are told that
The population proportion is p=0.4
The sample size is n = 39
The sample proportion is
Generally for normal approximation to be used
so np = 39 * 0.4 = 15.6 > 10
and
so n(1-p ) = 39(1-0.4) = 23.4 >10
Given that the both condition is meet it mean that it appropriate to use the normal approximation to find the probability that more than 43% of the people in the sample have high blood pressure
Answer:
There is no enough evidence to claim that the average cost of accesories is different from $3,000.
Step-by-step explanation:
<em>The significance level for this test is α=0.05.</em>
The classical method is based on regions of rejection of acceptance, according to the sample parameter. In this case, the standard deviation of the population is unknown.
The null and alternative hypothesis are:
This is a two-tailed test, with significance level of 0.05.
The t-value for this sample is:
The degrees of freedom are:
For df=49 and α=0.05 (two-tailed test), the critical values are , so the value t=0.787 is within the acceptance region.
The null hypothesis can not be rejected.