Question 36 Create a 80% confidence interval for a population mean from a sample of size 61 with sample mean = 3. The population standard deviation is known to be o = %3D [three decimal accuracy] [three decimal accuracy] > Next Question
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- Question 5, 8.3.49QUESTION 9 A sample of 25 part-time workers had an average hourly income of $15.0 with a sample standard error of $2.00. a) What is the interval for average hourly wage of all part-time workers at the 95% confidence? (round interval to the second decimal For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).Question 3 10 pts Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard deviation of 12.23 points, find a 90% confidence interval for the population standard deviation. FOLLOW THE PANIC METHOD Edit View Insert Format Tools Table 12pt ✓ v Paragraph B IUAT²:
- QUESTION 7 The daily electrical energy consumption (in Watts) during July for a random sample of 16 households was recorded. The mean was 3307 W and the standard deviation was 327 W. Assume the underlying distribution of the consumption is normal. Find the lower confidence limit (LCL) of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to the nearest whole number (integer).QUESTION 32 "A clinican has found a significant effect of a new drug and wants to know the effect size. If the population mean =120 with a standard deviation = 19.5 and the clinical observed a sample of n = 64 had a mean = 116, then what would be the effect size in terms of Cohen's d?" 2.44 -1.64 0.21 -0.62QUESTION 9 If the population standard deviation is equal to 7.68 and the sample size is 117, what is the margin of error for the corresponding 97% confidence interval to estimate the population mean? Use Excel to calculate and round your answer to 2 decimals.
- QUESTION 9 Assume that adults have IQ scores that are normally distributed with a mean of mu = 105 and a standard deviation sigma = 15. Find the probability that a randomly selected adult has an IQ between 85 and 125 and type an integer or decimal rounded to four decimal places. Make sure to use the positive or negative z score charts attached, in the eBook on MSL, or in a hardcopy of the textbook neg z scores.pdf pos z scores.pdf A. 0.4177 В. 0.5763 O C. 0.8176 D.0.6139 QUESTION 10 Assume a population of 40, 45, 47, and 53. Assume that samples of sizen=2 are randomly selected with replacement from the population. Listed below are the sixteen different samples. 45 53 53 53 45 40 45 45 45 47 40,53 4753 40 40 40,45 40 47 47 40 47 45 47 47 63 40 53 45 53 47 Click Sqve and Submit to saue and submit. Chck Save All Answers to save all ansuers. Save All An MQuestion 6 Ho Select an answer 0² The mean age when smokers first start is 13 years old with a population standard deviation of 2 years. A researcher thinks tha: smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 34 smokers found that their mean starting age was 12.3 years old. Do the data support the claim at the 10% significance level? What are the correct hypotheses? Н1 Ba Te HD SIX P s² Critical Values = ± years years find the following: (Give answer to at least 4 decimal places) (Give answer to at least 4 decimal places) Based on the above we choose to Select an answer The correct summary would be: Select an answer mean age smokers first start is different than 13. that the claim that theQUESTION 6 For the major airlines, 21% of all flights depart at least 15 minutes late with a standard deviation of 5%. Currently, 24% of all American Airlines flights depart at least 15 minutes late. If American wants to be in the top 10% of all major airlines with the FEWEST late departures, to what level must American cut its late departures? (please round your answer to 1 decimal place) Please incorporate Excell or graphing calculator functions in your answer.
- Question 5 > Past surveys indicate that 58% of Americans personally worry a great deal about federal spending and the budget deficit. Would it be considered unusual to have a random sample of 193 Americans where 143 of them personally worry a great deal about federal spending and the budget deficit? (We say that any observation more than 2 standard deviations from the mean is unusual.) оо Yes No Cannot tell from the information givenQuestion 6 "An electrical firm produces light bulbs that have a length of life that is approximately normally distributed with a mean of 660 hours and a population standard deviation of 25 hours. A new version of light bulbs is being produced and is assumed to be better than the previous version. To test this claim, a random sample of 92 new light bulbs are tested. Would you buy the new version of the light bulb or would you buy the older version if the random sample showed an average of 870 hours? Use a 0.05 level of significance." I will buy the older version until there is sufficient evidence to do otherwise. B I will buy the new version. C I will certainly buy the older version because I am 100% sure it is better. There is no sufficient data to make a sound conclusion.Question 5 You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 30 bacteria reveals a sample mean of = 80 hours with a standard deviation of s 6.4 hours. You would like to estimate the mean lifespan for this species of bacteria to within a margin of errar of 0.4 hours at a 98% level of confidence. What sample size should you gather to achieve a 0.4 hour margin of error? Round your answer up to the nearest whole number. bacteria Question Help: O Video Submit Question