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What is standard deviation of distribution of sample means

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Reference no: EM131065528

1. Is drug B superior to the currently used drug A in treating pancreatitis?

A Observational

B Case controlled Observational

C Double blind experiment

D Single blind experiment

2. A survey of 100 dog owners showed that the average dog checked the mail 11 times during an evening walk . Which question most probably represents the purpose of the study?

A how many mail check stops can a dog be expected to make on an evening walk

B how many dog owners take dogs for an evening walk

C how many dogs check the mail on an evening walk

D how many pet owners have dogs

3. The heights of 10 randomly selected fourth grade boys are in inches are 53 53 54 56 56 56 50 57 59 and 56. Find the sample standard deviations to 2 decimal places

A 2.67

B 2.54

C 3.54

D 2.56

4. Salesman for the ABC plastics company drive an average of 240 miles per day with a standard deviation of 36 miles. if samples of 25 daily mileages are taken what is the standard deviation of the distribution of sample means?

A 6.8

B 7.0

C 7.1

D 7.2

5. In 2003 the US death rate was 1.2 per 100,000 people do to motorcycle accidents. motorcycles in the US were involved in fatal crashes at the rate of 35.0 per million miles driven. if the population of the US is 300 million what is the expected number of deaths due to motorcycle accidents?

A 3600

B 10500

C 1200

D 11700

6. In one city there are 1,780 five year old children of whom 556 live with one parent only. among a sample of 615 of the five year old children from this city, 226 live with one parent only. find the population proportion of 5 year old who live with only one parent

A .35

B 556

C .37

D .31

7. A manufacturer wishes to test the claim that one of its pancake mixes has a mean of weight that does not equal 24 ounces as advertised. determine the conclusion of the hypothesis test assuming that the results of the sampling lead to rejection of the null hypothesis

A conclusion : support the claim that the mean is greater than 24 ounces

B conclusion: support the claim that the mean is not equal to 24 ounces

C conclusion :support the claim that the mean is equal to 24

D conclusion: support the claim that the mean is less than 24 ounces A 95% confidence interval for the mean of a normal population is found to be 17.6

Reference no: EM131065528

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