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alexandr1967 [171]
3 years ago
10

Suppose that at Elkhorn High School, the number of hours per week that seniors spend on homework is approximately Normally distr

ibuted with a mean of 18.6 and a standard deviation of 6.0. Mrs. Habrock takes a simple random sample of 36 seniors and calculates the sample mean homework hours per week. What is the mean of the sampling distribution of means for the 36 students?
Mathematics
1 answer:
Lisa [10]3 years ago
6 0

Answer: mean of sampling distribution of means = 18.6

Step-by-step explanation:

In sampling theory, the population mean is expected to equal to the mean of sampling distribution of means if the estimator is to be a good representative of the population. so, on this note, the mean of sample distribution of means is equal to the population mean = 18.6

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Answer:

Margin of Error decreases

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Step-by-step explanation:

The margin of error decreases as sample size increases given the same level of confidence, hence, the interval gets narrower.

The margin of error = (Zcritical * σ/√n) ; where, n is the denominator, as the denomination increases, the obtained value will decrease, hence, the margin of error.

When we have a false H0, then we expect a statistical result which will reject H0, with all facts remaining unchanged , increase in sample size n, will lead to decrease in Pvalue, because a lower P value increases the significance of statistical test needed to reject H0.

The power of a fixed level test when the null hypothesis is true, higher power is required to reject the null , increasing n will increase the probability of rejecting H0, by increasing the power of a fixed level test.

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Easy!<br> 1. Change 7 1/2 to a top heavy fraction.<br> 2. Change 3 2/3 to a top heavy fraction
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3 years ago
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3 years ago
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This might help

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ss7ja [257]

Answer:

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Step-by-step explanation:

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