A regional hospital is considering the purchase of a helicopter to transport critical patients. The relative frequency of X, the number of times the helicopter is used to transport critical patients each month, is created for a similarly sized hospital and is given in the probability distribution below. X 0 1 2 3 4 5 6P(X) 0.15 0.2 0.34 0.19 0.06 0.05 0.01Find the probability that the helicopter will be used at most 2 times to transport critical patients during a month. Then, determine whether this probability is unusual. Hint: At most (2) = x is less or equal to (2)

Which of the following statements would be a correct conclusion?   Hint: I can’t 

Weights of newborn babies are normally distributed with a mean of 7.5 lb and a standard deviation of 1.25 lb. A newborn whose weight is in the lowest 4% of the population is classified as low birth weight. Find the cutoff for the lowest 4% of birth weights. Hints: Find the Z score so that the area to the left of the Z score is .04 2nd -> Vars-> INVNORM(Area,

Studies indicate that 12% of American adults have diabetes. If 10 adult Americans are selected at random, what is the probability that at least four have diabetes? Hints: It’s a binomial probability distribution 🙂  1-binomcdf(10,.12,3)  

2.1 Explain what a ‘hunter-gatherer’ is. (2)

Calculate the P-value. Hint: Stats -> Test->  1PropZTest 

The National Health Statistics Reports published in 2008 reported the following weights for randomly selected samples of one year old girls and one year old boys. The means and standard deviations are in pounds. Group Girls Boys Mean 24.1 24.5 Standard Deviation 4.3 4.1 Sample Size 328 300 Construct and interpret a 96% confidence interval for the difference between the mean weights. Hints: Since you’re dealing with 2 independent samples, to construct the confidence interval STATS->TESTS-> 2SampleTinterval . (+,+) Positive difference ; (-,-) Negative difference ; (-,+) there’s not a significant difference between the variables 

Myers Corporation has the following data related to direct materials costs for November: actual costs for 4,700 pounds of material were $5.30 per pound and standard costs for 4,420 pounds of material are $6.30 per pound. What is the direct materials price variance?

Jaxson Corporation has the following data related to direct labor costs for September: actual costs are 10,200 hours at $15.75 per hour and standard costs are 10,800 hours at $15.50 per hour. What is the direct labor time(efficiency) variance?

The number of M&Ms in a bag were counted and recorded. The data are summarized in the frequency distribution below. X 52-53 54-55 56-57 58-59 60-61 f 1 7 12 7 2 Calculate the relative frequency of the 5th class. Hint: Relative Frequency = Frequency / sample size