Kurtis is a statistician who claims that the average salary of an employee in the city of yarmouth is no more than $55,000 per year. gina, his colleague, believes this to be incorrect, so she randomly selects 61 employees who work in yarmouth and record their annual salary. gina calculates the sample mean income to be $56,500 per year with a sample standard deviation of 3,750. using the alternative hypothesis ha: μ> 55,000, find the test statistic t and the p-value for the appropriate hypothesis test. round the test statistic to two decimal places and the p-value to three decimal places.

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол

Which graph depicts the path of a projectile

Determine if the following statement is true or false. the normal curve is symmetric about its​ mean, mu. choose the best answer below. a. the statement is false. the normal curve is not symmetric about its​ mean, because the mean is the balancing point of the graph of the distribution. the median is the point where​ 50% of the area under the distribution is to the left and​ 50% to the right.​ therefore, the normal curve could only be symmetric about its​ median, not about its mean. b. the statement is true. the normal curve is a symmetric distribution with one​ peak, which means the​ mean, median, and mode are all equal.​ therefore, the normal curve is symmetric about the​ mean, mu. c. the statement is false. the mean is the balancing point for the graph of a​ distribution, and​ therefore, it is impossible for any distribution to be symmetric about the mean. d. the statement is true. the mean is the balancing point for the graph of a​ distribution, and​ therefore, all distributions are symmetric about the mean.