A person with type O blood can donate red blood cells to anybody because type O blood is the universal donor blood type. About 4
2 answers:
Answer: (b) 0.8
Step-by-step explanation:
Assign 00 - 43 to people will have type O blood and assign 44 - 99 to people will not have type O blood
Trial 1 :
Blood group O - 4
Not Blood group O - 6
Trial 2 :
Blood group O - 4
Not Blood group - 6
Trial 3:
Blood group - 5
Not Blood group - 5
Trial 4:
Blood group: 5
Not Blood group - 5
Trials 5 :
Blood group - 2
Not Blood group - 8
(b) Out of the 5 trials it was in the fifth trial that the number of blood group O is not up to 3,so, the probability that at LEAST 3 of 10 people will have type O blood?
= 4/5
= 0.8
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Answer:
We conclude that a compact microwave oven consumes a mean of more than 250 W.
Step-by-step explanation:
We are given that an appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W with a population standard deviation of 15 W.
They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.
Let = <u><em>mean power consumption for microwave ovens.</em></u>
So, Null Hypothesis, :
250 W {means that a compact microwave oven consumes a mean of no more than 250 W}
Alternate Hypothesis, :
> 250 W {means that a compact microwave oven consumes a mean of more than 250 W}
The test statistics that would be used here <u>One-sample z test statistics</u> as we know about the population standard deviation;
T.S. = ~ N(0,1)
where, = sample mean power consumption for ovens = 257.3 W
σ = population standard deviation = 15 W
n = sample of microwave ovens = 20
So, <em><u>the test statistics</u></em> =
= 2.176
The value of z test statistics is 2.176.
<u>Now, at 0.05 significance level the z table gives critical value of 1.645 for right-tailed test.</u>
Since our test statistic is more than the critical value of t as 2.176 > 1.645, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u>we reject our null hypothesis</u>.
Therefore, we conclude that a compact microwave oven consumes a mean of more than 250 W.