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Question 41991

posted 11 months ago

Pretend that you want to study the linear relationship between voltage and current. Pick a sample of seven readings on seven different days (pick numbers of your own choice).
a. Graph the scatter plot.
b. Compute the value of the correlation coefficient.
c. Test the significance of the correlation coefficient. Use alpha equal to 0.05
d. Find the equation of the regression line.
e. Plot the regression line.
f. Find the residuals.
g. Graph the residual plot.
h. Find the three types of variation.
i. Find and interpret the coefficient of determination.
j. Find the sum of the squares of the residuals (least square).
k. Calculate and interpret the standard error S.
1. Test whether a linear relationship exists between x and y.

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Question 30659

posted 1 years ago

(2) If ABCD is a parallelogram such that M2ABC = 30. Show that DM >AM where M is the point of the intersection of the two diagonals of the parallelogram.

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Question 30658

posted 1 years ago

(1) If ABCD is a quadrilateral such that AC - BD. Show that the quadri-lateral PQRS is a rhombus where P,Q, R and S are the midpoints of the sides of the quadrilateral ABCD.

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Question 28573

posted 1 years ago

2. According to the website www.olx.uz, monthly rent for a two-bedroom apartment has a mean of $226 and a standard deviation of $50 in the city of Andijan. The distribution of the monthly rent does not follow the normal distribution. In fact, it is positively skewed. What is the probability of selecting a sample of 46 two-bedroom apartments and finding the mean to be at least $250 per month?

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Question 28576

posted 1 years ago

5. A WIUT student wants to estimate the mean monthly earnings of public schoolteachers in rural areas of Uzbekistan. She can tolerate a margin of error of $10 in estimating the mean. She would also prefer to report the interval estimate with a99% level of confidence. The student found a report by the State Committee of Statistics of Uzbekistan that reported a standard deviation of $16. What is the minimum required sample size?

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Question 28572

posted 1 years ago

1. Consumers were surveyed on the relative number of visits to a Korzinka store(often, occasional, and never) and if the store was located in an enclosed shopping center. The results are summarized in the following contingency table:
a. What is the probability of selecting a shopper who visited a Korzinka store often and the store was in an enclosed shopping center?
b. What is the probability of selecting a shopper who never visited a Korzinka store given that the store was not in an enclosed shopping center?

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Question 28574

posted 1 years ago

3. It is reported that 25% of the cars approaching the city of Tashkent are equipped with an anti-radar system. Suppose having an anti-radar system is an independent event. Find the probability that in a sample of 11 cars at least 3 of them have an anti-radar system.

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Question 28575

posted 1 years ago

4. According to the Ministry of Public Education, schools in Samarkand have closed an average of 6 days each year due to some type of emergencies. Assume that the number of school closure days can be approximated by a Poisson distribution.What is the probability that schools in Samarkand will close for 4 or 7 days next year?

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Question 28581

posted 1 years ago

10. On an ISDS mid-term exam, 26% of the students earned a score of 90 or above. I twas also true that 26% of the male students earned a score of 90 or above. Are the events earning a score of 90 or above and being male independent? Explain with a detailed proof.

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Question 28579

posted 1 years ago

Mr. John Smith is considering to run for the mayor of San Francisco, California.Before completing the petitions, he decides to conduct a survey of voters in his city. A sample of 500 voters reveals that 326 would support him in the upcoming election.
a. Develop a 98% confidence interval for the population proportion that supports Mr. John Smith.
b. Is there evidence to conclude that more than 60% voters support Mr. Smith?Conduct your hypothesis test at 5%. Provide your hypotheses, test statistic,rejection region and conclusions.

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