suppose IQ scores were obtained from randomly selected couples for 20 such pairs of people

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3.) Find the value of the test statistic z using Z= p-p/?pq/n
The claim is that the proportions of peas with yellow pods is equal to 0.25 (or 25%) the sample statistics from one experiment includes 470peas with 127 of them having yellow pods

6.) the test statistic is z=
750 random select adults, 587 said morally wrong, Significance level 0.05, 70% claim say morally wrong

9.) suppose IQ scores were obtained from randomly selected couples for 20 such pairs of people the linear correlation coefficient is 0.935 and the equation of the regression line is y=-6.8+1.05x were x represents the IQ score of the wife. Also the 20x values have a mean of 103.53 and the 20y values have a mean of 102.1 what is the best predicted IQ of the husband given that the wife has an IQ of 99? Use a significance level of 0.05
Please Show work

10.) The data show the time intervals after an eruption of a certain geyser find the regression equation letting the first variable be the independent x variable find the best predicted time of the interval after an eruption given that the current eruption has a height of 116 feet use a significance level of 0.05
Height 100,117,90,133,121,114,129,122
Interval 69,87,73,82,88,86,87,87
What is the regression equation?
Y=____+_____

2). Assume that a random sample is used to estimate a population proportion p. find the margin of error E that corresponds to the given statistics and confidence level
N=500,x=250,90% confidence ( round to four decimal places)

3.) Calculate the margin of error E=2a/2*0/?n if the necessary requirements are satisfied the confidence level is 99% the sample size is n=104and ?=15. Are the necessary requirements satisfied?

4). Use the given information to find the minimum sample size required to estimate unknown population 
mean µ.
How many adults must be randomly selected to estimate the mean FICO(credit rating) Score of working adults in a country? We want 95% confidence that the sample mean is within 5 points of the population mean and the population standard deviation is 61. The minimum sample sized required is ____ adults. Round to nearest whole number (Please show Work)

5). Salaries of 32 college graduates who took a statistics course in college have a mean x of $62,800. Assuming a standard deviation ? of $13,238. Construct a 95% confidence interval for estimating the population means µ
$____<µ<$______ round to the nearest integer as needed (Please Show Work)

7). In a study designed to test the effective of magnets for treating back pain 35 patients were given a treatment with magnets and also a sham treatment without magnets. Pain was measured using a scale from 0(n o pain) to 100(extreme pain)
After given the magnet treatments the 35 patients had pain scores with a mean of 11.0 and a standard deviation of 2.6 after being given the sham treatments the 35 patients had pain scores with a mean of 11.4 and a standard deviation of 2.3
A). construct the 90% confidence interval estimate of the mean pain score for patients given the magnet treatments
What is the confidence interval estimate of the population mean µ
____<µ<____ (round to one decimal place as needed)

B). Construct the 90% confidence interval estimate of the mean pain score for patients given the sham treatment. What is the confidence interval estimate of the population mean µ?
_____<µ<______. Round to one decimal place as needed
C). Compare the results. Does the treatment with magnets appear to be effective?

9). Listed below are the budgets (in Millions of dollars) and the gross receipts (in millions of dollars) for randomly selected movies

Budget (x)| 65, 88, 50, 33, 196, 97, 95
Gross (y)| 63, 65, 49, 59, 620, 141 45
Find the value of the linear correlation coefficient r 
R= round to three decimal places (Please Show work)

    • 8 years ago
    suppose IQ scores were obtained from randomly selected couples for 20 such pairs of people
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