If we increase our confidence level from 80 to 90 then to 95, interval will also

Question

If we increase our confidence level from 80 to 90 then to 95, interval will also increase for same the data. b) Correlation coefficient 'r', and 'm' of regression equation is same. c) A statistical hypothesis is a statement and interpretation about a sample. d) To find the best-fit-line, the correlation coefficient of the paired data is a relevant information. e) r = +0.900 shows stronger correlation than r = -9.91. a. A company claims that Write the H_o and H_a statements. If rejected, write interpretation. b. Find the Z value for two-tail test when LoS alpha = 8%, ______. Show in graph as well c. Find Left tail test for t-distn, when, alpha = 0.025, and sample sine is 28. _____. Show in graph as well. d. Use P-value method to conclude on hypothesis for two-tail test for alpha = 0.05 and Z-score = -1.765 e. Correlation coefficient between work-out hours and LDL cholesterol of 22 people found to be 0.55. At alpha = 0.01, what will be your comment on significance of correlation? Mean salary of accountants is $35,000. A random sample of 24 accountants selected. What is the probability that the mean salary of the sample is less than $33,000, if standard deviation of the population is $6000? You are asked to study average age of students going to nursing school, with a margin of error 0.45 years. From previous study it was found that standard deviation is 1.5 years. What sample size you will chose to have 95% of confidence level? Interpret your result.

Explanation / Answer

1

a)

As the confidence level increases, width of confidence interval also increases.

Hence, this is true.

b)

Correlation coeffcient r and slope m always have same sign but it is not necessary that they have same magnitude.

Hence, this is false.

c)

Hypothesis always is a statement about population parameter.

Hence, this is false.

d)

Yes, using correlation coeffcient paired data set and mean and SD of each data set one can find the line of best fit.

Hence, this is true.

e)

r =-9.91 is not a valid correlation coefficient.

Hence, this is false.

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