FinA survey conducted by a shopping mall group showed that in a metrocity spends an average of K500 on clothes every month. Supoose a sample of 81 such families resulted in a sample mean of k540 per month and a standard deviation of k150. Develop a 95% confidence interval estimator of the mean spent per month

A sample of 37 inchworms in Cititon Park was collected and measured. Their lengths had a mean of 2.56 cm with a standard deviation of 0.09 cm. Find the 95% confidence interval for the mean length of all the inchworms in Cititon Park.

A random sample of 106 body temperatures taken from healthy adults had a mean of 98.29o F and a standard deviation of 0.62o F. Find a 99% confidence interval estimate of the mean temperature of all healthy adults.

A major television manufacturer has determined that its 40-inch LED televisions have a mean service life that can be modeled by a normal distribution with a mean of six years and a standard deviation of one-half year.  If the manufactuerer offers service contracts of four years on these televisions what percentage can be expected to fail from wear-out during the service period?

Recent research indicates that a labor force with average education less than 12 years is insufficient to support the rapid growing economy. A survey randomly sampled 64 working-age adults from an underdeveloped urban city in South America and asked about the years of education they received. The mean is 11 years and standard deviation is 3.6. There are no extreme outliers. Based on this data, can we claim the working-age adults in this city have less than 12 years of education on average?  (1) We need a hypothesis for  ________  to test this claim. a) one-sample t-test b) one-proportion z-test c) two-sample t-test d) two-proportion z-test (2) The null hypothesis is all working-age adults have   __________  years of education on average in this city.  a) 12 b) less than  c) more than  (3) The CLT conditions are    ____________ a) satisfied  b) not Satisfied  because    _______________  . a) we have a random sample and n > 30 with no extreme outlier observed  b) we have a random…