## Confidence Intervals for the Mean sigma known I need help with this question:

Question Confidence Intervals for the Mean sigma known I need help with this question: Assuming .05 as your alpha value, make up a problem similar to this one. Make up 36 gas prices for your example. Use price values in your list that some you made up and be sure they are similar to the prices you have had in your area. List the values in your post.Formula you used above for the confidence interval should be this one:The formula is E= zsubc * sigma / sqrt nWhere the left hand endpoint is xbar – E and the right hand endpoint is xbar EAlso, how can I need help in how to place all this information on excel

## Read the short article below.

-Does this study indicate a strong link between TV watching and the incidence

Question Read the short article below.

-Does this study indicate a strong link between TV watching and the incidence of ADHD? -Why or why not? -What questions do you have about the study after reading the article? A long term study on the impact of TV on ADHD development was recently published.Researchers in New Zealand found that kids who watched more than 2 hours of TV per day between ages 5 and 11 were significantly more likely to develop symptoms of attention deficit disorder (ADHD) than those who watched less.”Those who watched more than two hours, and particularly those who watched more than three hours, of television per day during childhood had above-average symptoms of attention problems in adolescence,” Carl Landhuis of the University of Otago in Dunedin wrote in his report, published in the journal Pediatrics.Young children who watched a lot of television were more likely to continue the habit as they got older, but even if they did not the damage was done, the report said.”Hence, children who watch a lot of television may become less tolerant of slower-paced and more mundane tasks, such as school work,” the researchers wrote.The most interesting part of the article was the possible explanations for why this relationship exists. The researchers thought (a) rapid scene changes influence brain development, and (b) television replaced other activities like reading — activities that require attention development.This is a pretty old idea about ADHD, but I think this new data can shore-up some of those concerns.

## -A large community college wants to increase its retention

Question

-A large community college wants to increase its retention rate (the number of new students who start one year and return the next) of 45%. After implementing several new programs to improve retention over a two year period, the school randomly sampled 360 students who started one year and found 194 of them returned the next year. the college wants to determine if the initiative is working to increase retention. Part a- state the null and alternative hypotheses.Part b- Compute the test statistic (round to two decimal places) and corresponding p-value (round to three decimal places).Part c- What is test decision and the conclusion in context drawn from the hypothesis test at a 0.05 significance level? -A local news agency reports that 47% of a city’s adult population regularly uses supplemental vitamins. A manager at a local grocery store believes that number is significantly different and collects data from 170 randomly selected adults from the city to test the claim. The table below summarizes the data. Adults Surveyed Does Regularly Take Supplemental Vitamins 91Does Not Regularly take Supplemental Vitamins 79Total 170Part a- State the null and alternative hypothesesPart b- Complete the test statistic (round to 2 decimal places) and corresponding p-value (round to 3 decimal places).Part c- What is the test decision and the conclusion in context drawn from the hypothesis test at a 0.05 significance level?Part d- Find a significance level that will chance the conclusion drawn above.

## · The average depth of the Hudson Bay is 305 feet. Climatologists

Question · The average depth of the Hudson Bay is 305 feet. Climatologists were interested in seeing if the effects of warming and ice melt were affecting the water level. Fifty- five measurements over a period of weeks yielded a sample mean of 306.2 feet. The population variance is known to be 3.57. Can it be concluded at the .05 level of significance that the average depth has increased? (Use the Traditional methodA) State the hypotheses and identify the claim. A) H0: µ=305, Ha: µ

## · A researcher claims that the average wind speed in a certain

Question · A researcher claims that the average wind speed in a certain city is 8 miles per hour. A sample of 32 days has an average wind speed of 8.2 miles per hour. The standard deviation of the population is .6 miles per hour. At 5% level of significance is there enough evidence to reject the claim?A) State the hypotheses and identify the claim. A) H0: µ=8 claim, Ha: µ ≠ 8 B) H0: µ

## -What amount would have to be invested today for the future

Question

-What amount would have to be invested today for the future value to be $10,000 after 20 years if the rate of return is: a. 5% compounded quarterly? b. 7% compounded quarterly? c. 9% compounded quarterly? 2.How long did it take $4625 earning 7.875% compounded annually to grow to $8481.61? (3.An annuity consists of semiannual payments of $950 for a term of 3⁄2 years. Using a nominal rate of 9% compounded quarterly, calculate the ordinary annuity’s; a. Present value. b. Future value. 4. If you want to purchase an annuity providing an income of $2000 at the end of each month for five years, how much will it cost if the purchase funds earn 18% compounded monthly? ( 2 marks)A. $192,429.30B. $78,760.54C. $80,681.00D. $4886.44E. $818.605.Fatima has made investments of $10,000 at the end of every three months for the last 8 years. She has earned 11% compounded quarterly? What is the value of the investments today? A. $97,427 B. $211,003 C. $320,000 D. $460.792 E. $502,699

## find an article discussing survey results for an election. It can

Question Get Answer find an article discussing survey results for an election. It can be for any election in any state as long as the article reports the number surveyed and the margin or error. Once you find the article, do the following: a) Verify the margin of error by doing you own calculation. Include the calculation in your post. It is okay if the margin of error in the article is off by 0.1 from what you get (roundoff error). b) Report the confidence intervals for the top two candidates in the article. Do they overlap or not? c) Discuss the headline or the opening sentence of the article as it relates to your answer for part b. d) Include at the end of your post a link to the article.