a random sample of 28 patients across the country had an average cost of 5250 with a standard deviation of a= 0.025 can it be concluded that the mean is less than 5400

  1. 👍 0
  2. 👎 0
  3. 👁 133
  1. Z = (score-mean)/SEm

    SEm = SD/√n

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.025) related to the Z score.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    Suppose a new treatment for a certain disease is given to a sample of n=200 patients. The treatment was successful for 166 of the patients. Assume these patients are representative of the population of individuals who have this

  2. statistics

    A travel company is investigating whether the average cost of a hotel stay in a certain city has increased over the past year. The company recorded the cost of a one-night stay for a Friday night in January of the current year and

  3. statistic

    A special diet is intended to reduce systolic blood pressure among patients diagnosed with stage 2 hypertension. If the diet is effective, the target is to have the average systolic blood pressure of this group be below 150. After

  4. Microeconomics

    When average total cost is declining then: a) marginal cost must be less than average cost b) marginal cost must be greater than average cost c) average toal cost must be greater than average fixed cost d) average variable cost

  1. statistics

    In a preliminary study, the sample standard deviation for the duration of a particular back pain suffered by patients was 18.0 months. How large a random sample is needed to construct a 90% confidence interval so that an estimate

  2. Math

    1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the survey many, many times, each time recording a different

  3. Statistics

    Allegiant Airlines charges a mean base fare of $89. In addition, the airline charges for making a reservation on its website, checking bags, and inflight beverages. These additional charges average $35 per passenger. Suppose a

  4. Stats

    A random sample of 30 women drank an average of 15 cups of coffee per week during examination finals, with the sample standard deviation equal to 3 cups. A upper limit of an approximate confidence interval with 95% of the

  1. Stats

    A dean wishes to estimate the average cost of the freshman year at a particular college correct to within $500, with a probability of 0.95. If a random sample of freshmen is to be selected and each asked to keep financial data,

  2. Statistics

    A survey organization takes a simple random sample of 625 households from a city of 80,000 households. On the average, there are 2.30 persons per sample household, and the SD is 1.75. Say whether each of the following statements

  3. probability and statistics

    the average age for licensed drivers in the country is u=40.3 years with a standard deviation of o= 13.2 years. a. a researcher obtained a random sample of n=16 parking tickets and computed an average age of m=38.9 years for the

  4. statistics

    The Medical Rehabilitation Foundation reports that the average cost of rehabilitation for stroke victims is at least $24,500. To see if the average cost might be different at a particular hospital, a researcher selects a random

You can view more similar questions or ask a new question.