Suppose a certain species bird has an average weight of xbar 3.40 grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with sigma 0.29 grams. Find the sample size necessary for a 98% confidence level with a maximal error of estimate E=0.09 for the mean weights of the hummingbirds. (Points: 5)

  1. 👍
  2. 👎
  3. 👁
  1. I did 2.33x.29/.09 then sqared and got 56.3 this good?

    (ZcO/E)^2 =n is this right?

    1. 👍
    2. 👎
  2. Formula:
    n = [(z-value * sd)/E]^2
    ...where n = sample size, z-value will be 2.33 using a z-table to represent the 98% confidence interval, sd = 0.29, E = 0.09, ^2 means squared, and * means to multiply.

    Your answer looks correct! Good job.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science 6B

    1. Which of the following is an example of a competitive relationship in an ecosystem? A)an insect species that captures other insect species by posing as a leaf in a tree B)a bird species that does not build its own nests but

  2. science

    Please help A researcher performed an analysis of the elemental composition of several fish species living in the same body of water. The amount (in parts per million) of iron (Fe), calcium (Ca), potassium (K), sodium (Na), and

  3. Applied Calculus

    For the average person that is still growing, the rate of change in weight W (in pounds) with respect to height h (in inches) is approximately dW/dh=0.0015h^2 pounds per inch. Suppose that the average person that is 60 inches tall

  4. MATH

    The average weight of a empty soda can isv18.2 grams. 12 ounces of soda weighs 373.96 grams. How much does a soda can full of soda weight?

  1. science

    A species that influences the survival of many other species is an ecosystem is called a(n) (A) Niche species (B) Extinct species (C) Keystone species (D) Endangered species

  2. math

    a certain brand of powdered milk is advertised as having a net weight of 250 grams. if the net weights of a random sample of 10 cans are 253, 248, 252, 245, 247, 249, 251, 250, 247, 248 grams. can it be concluded that the average

  3. science

    please help i have no time and if i fail i'm screwed!! Population and Ecosystems Unit Test 1 of 14Items Item 1 Three bird species share a habitat. Bird A eats insects and plant seeds. Bird B drinks flower nectar. Bird C eats plant

  4. Science

    2. Study the amino acid sequences of the same protein taken from four different species of plants. Which pair of plants is most closely related? Species 1: -A-P-A-C-W- Species 2: -G-P-G-S-F- Species 3: -A-P-A-C-F- Species 4:

  1. Statistics

    Babies born weighting 2500 grams (about 5.5 pounds) or less are called low-birth-weight babies, and this condition sometimes indicates health problems for the infant. The mean birth weight for children born in a certain country is

  2. Science

    Which of the following explains why a bone in a bird’s wing is homologous to a bone in a lizard’s front leg? a.The bones in the two species provide for the same type of motion. b.The bones in the two species are both vestigial

  3. evolutionary bio

    following a drought on Daphne Major, the beaks of the offspring of the surviving medium ground finches (average 14mm) were larger than the beaks of the entire population prior to the drought ( 12mm average). Based on the prior

  4. Science

    A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation arises in this bird population that increases the length of its beak. Although many mutations are harmful,

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