sample of 10 networking sites for a specific month has a hean of 26.1 and a standard deviation of 4.2. rompt Find the value of t nswer Choose a match O O 3.25 1.83 ta/2 with 99% confidence level. 20.5 μ<31.5 21.78 <<30.42

The average size of a farm in one county is 162 acres with a standard deviation of 38 acres. The average size of a farm in a second county is 182 acres with a standard deviation of 16 acres. Assume the data were obtained from two samples that had 30 farms each.  Can it be concluded that the average size of the farms in the two counties is different?  (Let α = 0.05)                              First , choose which hypothesis statements is correct.     T-stat =               Round to 2 decimal places. P-value =    Decision:          Type Retain Ho or Reject Ho

The additional growth of plants in one week are recorded for 6 plants with a sample standard deviation of 1 inches and sample mean of 12 inches. t∗ at the 0.10 significance level = Margin of error = Confidence interval = [                ,              ]                               [smaller value, larger value]

A particular brand of cereal advertises it packages weigh 510 g.You wish to determine if on the average the weight is less than 510g. A simple randomsample of 81 packages from a large lot are weighed. The average weight is found to be509.5 g with a standard deviation of 0.4 g. 1. Perform a test at a level of significance 0.05. 2. What is the power of the test if you wish to detect an average departure of 0.2 gunderweight (can be stated as weighing 509.8g).  3. What sample size is needed to have a power of 90%?  Please show all steps. Thank you!

A random sample of 100 lightning flashes in a certain region resulted in a sample average radar echo duration of .81 sec and a sample standard deviation of .34 sec. Calculate a 98% (two-sided) confidence interval for the true average echo duration p. Round final answer to 3 decimal places (i.e., x.xxx). CI =( ? , ? )

A company produces laundry deyergents wants to estimate the mean amount of detergent in their 64 ounce jugs qt a 99% confidence level. The cimpany knows that tge standard deviation of amounys of detergent in such jugs is 0.20 ounce. How large a sample should the company take so that the estimate is within 0.04 ounce of the population mean?

In a random sample of twelvetwelve cell​ phones, the mean full retail price was ​$591.50591.50 and the standard deviation was ​$179.00179.00. Assume the population is normally distributed and use the​ t-distribution to find the margin of error and construct a 9090​% confidence interval for the population mean muμ. Interpret the results.

A local hardware store claims that the mean waiting time in line is less than 3.5 minutes. A random sample of 20 customers has a mean of 3.2 minutes with a standard deviation 0.8 minute. If a = 0.10, test the store's claim. Ho: u = 3.5 Hạ: H [ Select ] Test statistic: [ Select ] p-Value = [ Select ] Decision: [ Select ] > > >

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