An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 45 hours. How large a sample is needed if we wish to be 94% confident that our sample mean will be within 12 hours of the true mean? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. The required sample size is. (Round up to the nearest whole number as needed.)
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- In a random sample of 100 audited estate tax returns, it was determined that the mean amount of additional tax owed was $3498 with a standard deviation of $2519. Construct and interpret a 90% confidence interval for the mean additional amount of tax owed for estate tax returns. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Click here to view the table of critical t-values. Find and interpret a 90% confidence interval for the mean additional amount of tax owed for estate tax returns. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to the nearest dollar as needed.) O A. 90% of taxes owed for estate tax returns are between $ and $ O B. There is a 90% probability that the mean additional tax owed is between $ OC. One can be 90% confident that the mean additional tax owed is between $ and $ and $Salaries of 42 college graduates who took a statistics course in college have a mean, x of $68,700. Assuming a standard deviation, o, of $18,646, construct a 90% confidence interval for estimating the population mean u. Click here o view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. $<μ<$ (Round to the nearest integer as needed.)Please solve correctly with a proper explantion.
- An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 35 hours. If a sample of 45 bulbs has an average life of 780 hours, find a 96% confidence interval for the population mean of all bulbs produced by this firm. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. |<µ<. (Round to the nearest integer as needed.) The confidence interval isSalaries of 43 college graduates who took a statistics course in college have a mean, x, of $66,900. Assuming a standard deviation, o, of $12,687, construct a 90% confidence interval for estimating the population mean u. Click here to viewat distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. SSalaries of 32 college graduates who took a statistics course in college have a mean, x, of $62,000. Assuming a standard deviation, 6, of $17,889, construct a 95% confidence interval for estimating the population mean µ. Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table.It is claimed that the proportion of adults with at least one chronic disease in a certain country might be more than the reported number, which is only 25%. A random sample of 85 adults are surveyed, of which 28 are found to suffer from at least one chronic disease. Use a 0.01 level of significance to test the above claim. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard nomal distribution table. (a) Identify the null and alternative hypotheses. O A. H,: p= 0.25 against H,: p 0.25 OD. Hp: p>0.25 against H,: p=0.25 O E. H,:p= 0.25 against H,: p 0.25 OF. H:p OC. z (c) The z value for test can be calculated as (Round to two decimal places including any zeros.) (d) Make an appropriate conclusion. O A. Reject the null hypothesis because there is not significant evidence that more than 25% of the adults suffer from at least one chronic disease. O B. Do not reject the null hypothesis because there is not significant evidence that…I need help with A and B. Thank you.Salaries of 38 college graduates who took a statistics course in college have a mean, x, of $65,900. Assuming a standard deviation, o, of $14,369, construct a 95% confidence interval for estimating the population mean μ. Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. <μ<$ (Round to the nearest integer as needed.)In a random sample of 36 criminals convicted of a certain crime, it was determined that the mean length of sentencing was 54 months, with a standard deviation of 13 months. Construct and interpret a 90% confidence interval for the mean length of sentencing for this crime. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Click here to view the table of critical t-values. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to one decimal place as needed.) O A. There is a 90% probability that the mean length of sentencing for the crime is between and months. O B. We can be 90% confident that the mean length of sentencing for the crime is between and months. O C. 90% of the sentences for the crime are between and months.K In a random sample of 36 criminals convicted of a certain crime, it was determined that the mean length of sentencing was 63 months, with a standard deviation of 12 months. Construct and interpret a 95% confidence interval for the mean length of sentencing for this crime. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Click here to view the table of critical t-values. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to one decimal place as needed.) OA. 95% of the sentences for the crime are between and months B. There is a 95% probability that the mean length of sentencing for the crime is between OC. We can be 95% confident that the mean length of sentencing for the crime is between and months. and months. View an example Get more help - Q Search 144 80 G I B N M DI 7 K no 12 insert prt sc 741 P A 4 L Clear all Check answer delete…In a survey, 39% of the respondents stated that they talk to their pets on the telephone. A veterinarian believed this result to be too high, so she randomly selected 160 pet owners and discovered that 56 of them spoke to their pet on the telephone. Does the veterinarian have a right to be skeptical? Use the a = 0.05 level of significance. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). Because npo (1-po) =U V10, the sample size is V 5% of the population size, and the sample the requirements for testing the hypothesis satisfied, (Round to one decimal place as needed.) What are the null and alternative hypotheses? V versus H,: (Type integers or decimals. Do not round.) Но Determine the test statistic, zo Zo = |(Round to two decimal places as needed.) Determine the critical value(s). Select the correct choice below and fill in the answer box to complete your choice. (Round to two decimal places as…SEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th…StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C…StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage LearningElementary Statistics: Picturing the World (7th E…StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. 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