Question 13 (1 point) Based on a sample of size 18, the following regression equation is derived: =25+0.2X. If the standard error of the regression slope is equal to 0.1, what is the value of the test statistic to test if the predictor variable is significant (1 is not zero)? 1 2 4.2 0.16 Question 14 (1 point) We have collected a sample of size 30. Assuming that we do not have the population standard deviation, if the standard error of the sample mean is 0.369, what is the standard deviation of the sample of size 30? Note: 1- Round your intermediate numbers to 4 decimal places. 2- Round you final answer to 3 decimal places. Enter your final answer to 3 decimal places. Your Answer: Answer Question 15 (1 point) Hoping to attract more shoppers downtown, a city builds a new public parking garage in the central business district. The city plans to pay for the structure through parking fees. For a random sample of 46 weekdays, daily fees collected averaged $11400 with a standard deviation of $1300. Find a 90% confidence interval for the mean daily income this parking garage will generate and report the lower limit. Note: 1- Only round your final answer to the nearest integer. Your Answer: Answer Question 16 (1 point) Consider the following basic statistics describing a data set: n = 690, y = 3212.56, s = 91.14 Calculate the standard error of the sample mean. Note: 1- Round your intermediate numbers to 4 decimal places. 2- Round you final answer to 3 decimal places. Enter your final answer to 3 decimal places. Your Answer: Answer Question 17 (1 point) A study investigated how many pesticide particles were found on 25 organic apples. It was found that the sample contained on average 0.0772 ppm (particles per million) with a standard deviation of 0.0311 ppm. What is the lower limit of the 99% confidence interval? Note: 1- Round your intermediate numbers to 4 decimal places. 2- Round you final answer to 3 decimal places. Enter your final answer to 3 decimal places. Your Answer: Answer Question 18 (1 point) Consider the following basic statistics describing a data set: n = 30, y = 7.77, s= 1.83 What is the margin of error for this calculation for a 99% level of confidence? Note: 1- Round your intermediate numbers to 4 decimal places. 2- Round you final answer to 3 decimal places. Enter your final answer to 3 decimal places. Your Answer: Answer