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Q1) Results from survey of 1000 respondents, point out that 545 favour the dealth penalty for capital crimes. By using a 90% confidence level. Create confidence interval estimate for population proportion.
Q2) Find out minimum sample size for margin of error of 6 days and population standard deviation of 18 days using confidence level of 95% to evaluate an unknown population mean for number of days missed from work per year.
Let X1, X2, ... , X50 denote actual net weights of 50 randomly selected 80-lb bags of concrete mix.
a) If expected weight of each bag is 80-lb and standard deviation is 2-lb, compute P(79.75 £ X bar £ 80.25).
b) If expected weight of each bag is 79.5-lb rather than 80-lb, so that on average bags are under-filled, but standard deviation is still 2-lb, compute P(79.75 £ X bar £ 80.25).
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
Derive the standard error of proportion, the margin error and the 95% confidence interval for the proportion indicating preference to flirting.
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
Computing the expected values for the given probability distribution and evaluate the expected values of the following probability distributions
Pproportion who are sent to prison after pleading innocent and being found guilty? No, as the test value -1.96 is inside interval (-2.58, 2.58), No, as the test value -4.94 is outside interval (-1.96, 1.96).
Is there evidence of a significant difference in the proportion who get their news primarily from newspapers between those 36 to 50 years old and those above 50 years old? (use α = 0.05)
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Describe your re..
Under proposed plan, how long, on average, will patient stay in ER? On average, how long will Potential Admit stay in ER?
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
High levels of glucose in the blood are indications of diabetes, which is becoming more prevalent in the United States. Diabetes can lead to many complications such as blindness and heart disease. A random sample of 180 individuals had their blood su..
Determine and report the within-group slope which relates Y to Xc (for this, you will have to look at your regression printout).
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