You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 22.7 dollars. You would like to be 95% confident that your estimate is within 2 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? Hint: Video [+] n =
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- You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 79.3 dollars. You would like to be 98% confident that your estimate is within 1.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately σ=37.8 dollars. You would like to be 95% confident that your estimate is within 4 dollar(s) of average spending on the birthday parties. How many moms do you have to sample? Do not round mid-calculation. n =Duke Colleges wants to know the time in class they will execute on the upcoming school year. On average, 65 classroom has 8 hours of class and the standard deviation sample is 3 hours. Find the interval estimate of population in 90% NOTE: HANDWRITTEN SOLUTION A MUST
- You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = to be 95% confident that your estimate is within 5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? 54.2 dollars. You would likeA researcher is interested in finding a 95% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 124 students who averaged 33.8 minutes concentrating on their professor during the hour lecture. The standard deviation was 12.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With 95% confidence the population mean minutes of concentration is between and minutes. c. If many groups of 124 randomly selected members are studied, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean minutes of concentration and about percent will not contain the true population mean minutes of concentration.2. Calculate Karl Pearson's co-efficient of correlation between percentage of pass and failure from the following data. No, of student (x): 800 600 900 700 500 400 No. passed (v): 480 300 450 560 450 300
- You are conducting a study to see how much high school students spend on back to school shopping. You first need to determine how many high schoolers to survey. Based on a study done last school year, you believe the population standard deviation is approximately o = 60.7 dollars. You would like to be 90% confident that your estimate is within 1 dollar(s) of average spending on back to school shopping. How many high school students do you have to sample?You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 24.3 dollars. You would like to be 99% confident that your estimate is within 10 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 4 standard deviations from the mean. The quality control engineer knows that the bolts coming off the assembly line have mean length of 13 cm with a standard deviation of 0.05 cm. For what lengths will a bolt be destroyed? Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) OA. A bolt will be destroyed if the length is less than OB. A bolt will be destroyed if the length is greater than cm. OC. A bolt will be destroyed if the length is between OD. A bolt will be destroyed if the length is less than cm. KOTE cm and cm. cm or greater than cm.
- You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 24.7 dollars. You would like to be 98% confident that your estimate is within 2.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? Hint: Video [+] n =You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 61.5 dollars. You would like to be 90% confident that your estimate is within 1.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =n the 1992 presidential election, Alaska's 40 election districts averaged 2111 votes per district for President Clinton. The standard deviation was 551. (There are only 40 election districts in Alaska.) The distribution of the votes per district for President Clinton was bell-shaped. Let X = number of votes for President Clinton for an election district. (Source: The World Almanac and Book of Facts) Round all answers except part e. to 4 decimal places.a. What is the distribution of X? X ~ N(,)b. Is 2111 a population mean or a sample mean? Select an answer Population Mean Sample Mean c. Find the probability that a randomly selected district had fewer than 2134 votes for President Clinton. d. Find the probability that a randomly selected district had between 2048 and 2241 votes for President Clinton. e. Find the first quartile for votes for President Clinton. Round your answer to the nearest whole number.