ALL ABOUT STATS

Question 10 of 15 Which of the following is true? The t distribution should be used to help make inferences when Select the correct response @ the population standard deviation is known the sampling population is unimodal. O the population standard deviation is unknown, the sample size is small, and the sampling distribution is normal @the sampling population is nonnormal,Question 11 of 15 1 Poi Fill in the blanks The length of time it takes a car salesperson to close a deal on a car sale is assumed to be normally distributed A random sample of 100 such times was selected and yielded a mean of 3 hours and variance of 0.5 hour. The 90 percent confidence interval for the mean length of time it takes a car salesperson to sell a car is hours to hours [round your answer to 2 decimal places)Question 12 of 15 1 Poir The central limit theorem CANNOT be applied to sampling distributions when the samples are obtained from discrete distributions. Select the correct response True FalseQuestion 13 of 15 Fill in the blanks Commuters claim that the average distance they have to commute to work is 26 kilometers per day A random sample of 16 commuter was surveyed and yielded an average distance of 31 km and a standard deviation of 8 km Create a 99%% confidence interval for the population mean km to km (round your answer to 2 decimal places)Question 14 of 15 I Poir Samples of size 49 are selected at random from an infinite population whose mean and variance are both 25, It is assumed that the distabution of the population is unknown, The mean and the standard deviation of the distribution of sample means are Select the correct response 49 and 3.5714 respectively 25 and 5 respectively 25 and 0.5102 respectively )25 and 0.7143 respectivelyQuestion 15 of 15 A single value prediction for a parameter is called a point estimate. Select the correct response True FalseQuestion 8 of 15 1 Poin Fill in the blanks Suppose that a quality control manager wishes to measure the average amount of hot chocolate mix dispensed in a 12-ounce package. From preliminary samples, the standard deviation was estimated to be 0.3 ounce. How large a sample must be taken to be 95 percent confident that the margin of error will be within 0.05 ounce?Question 9 of 15 I Point Fill in the blanks: The average annual salary of public school teachers who graduated from a certain college is to be studied A random sample of 100 teachers has a mean salary of Php 31,578, with a standard deviation of Php 4,415. Construct a 99 percent confidence interval for the average salary of the population of public school teachers who graduated from this specific college 99% confidence interval: pesos to pesos (round your answer to the nearest peso, no need to separate thousands with a comma)