The average age of NCAA competitors is 23 years old. The stu…

The average age of NCAA competitors is 23 years old. The study seeks to test if the average age of NCAA competitors is lower. A sample of NCAA competitors were randomly sampled, and the outcome of the sample average of NCAA competitors was 19. Assume a standard deviation of 2. Calculate the z-score. Show your work or you will not receive full credit.

The rent for a studio apartment in Orlando were taken for 16…

The rent for a studio apartment in Orlando were taken for 16 apartments. The sample average is $1,800, with a sample standard deviation of $400. Calculate the confidence interval, at 95% confidence. The t-score corresponding to t16@95% = 1.734 = t. Show your work. Formula: ȳ ± t SE(ȳ) = ȳ ± t  s/√n

A study of recent study of citrus tress in Florida was done…

A study of recent study of citrus tress in Florida was done to check if lifespan have decreased from the average of 12 years. A sample of 42 trees was taken, with a sample average of 9 years, resulting in rejection of H0 : μ = 12, with sufficient evidence to support a decrease.  This study’s conclusions were later found to be incorrect due to a sampling issue. True or False: The error made resulted in a False Negative?

Citrus greening disease has impacted Florida citrus trees by…

Citrus greening disease has impacted Florida citrus trees by reducing the average lifespan. A sample of 9,482 trees was taken, with a sample average lifespan of 10 years, resulting in rejection of H0 : μ = 30, with sufficient evidence to support a decrease.  What is the impact of such a decrease?