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  • AP stats: Sampling Methods?

    Biologists want to estimate the number of deer living in a certain region. They will use a method known as a hair snare. A hair snare is a length of barbed wire set up near a salt lick, where deer can lick minerals and nutrients from salt deposits. The wire snares hair from the neck of the deer. The hair is collected and sent for analysis.

    The biologists will randomly place 90 salt licks throughout the region. The region consists of 3 areas: the town, the forest, and the lake, as shown in the following diagram.

    https://assets.learnosity.com/organisations/537/VR...

    The link above is the image^^^

     A.) Two methods have been proposed for choosing where to place the salt licks: a simple random sample or a stratified random sample, with area as strata. Give one reason why the stratified random sample might be the better method for choosing where to place the salt licks.

    B.) By using the hair snare method, deer are sampled with replacement. Why is sampling with replacement a problem in this context, and how would the problem impact the estimate of the number of deer living in the region?

    Thank Youuuu!!!!!

    Homework Help1 month ago
  • Ap Stats FRQ. ?

    Researchers studying a pack of gray wolves in North America collected data on the length x, in meters, from nose to tip of tail, and the weight y, in kilograms, of the wolves. A scatterplot of weight versus length revealed a relationship between the two variables described as positive, linear, and strong.

    For the situation described above, explain what is meant by each of the following words.

    Positive:

    Linear:

    Strong:

    The data collected from the wolves were used to create the least-squares equation ŷ = -16.46 + 35.02 x.

    Interpret the meaning of the slope of the least-squares regression line in context.

    One wolf in the pack with a length of 1.4 meters had a residual of -9.67 kilograms. What was the weight of the wolf?

    1 AnswerHomework Help2 months ago
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    AP stats question, please help!!?

     Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods as well as on the accuracy and completeness of your results and explanations.

    The graph below shows the monthly average temperatures, in degrees Fahrenheit, for two cities–Madison,Wisconsin, and Juneau, Alaska–in the United States.

    a.) Based on the graph, compare the two cities with respect to the monthly average temperatures over the year. Address both similarities and differences in the overall patterns.

    B.) For which of the two cities is the standard deviation of the 12 monthly average temperatures greater? Justify your answer without performing any calculations.

    Mathematics2 months ago
  • AP Stats question. Help asap!!?

    The manager of a vacation resort believes that the ages of adult visitors to the resort can be modeled by a normal distribution. The manager surveyed a random sample of 765 visitors and recorded their age. A summary of the responses is shown in the frequency table, where x represents the age of the visitor.

    (a) Construct a histogram of the distribution of ages.

    (b.)Write a few sentences to describe the distribution of ages of the adult visitors to the resort

    (c) Does the histogram provide convincing evidence that the surveyed ages come from a normal distribution? Explain your answer.

    Mathematics2 months ago
  • AP stats question. Need help asap!?

    Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods as well as on the accuracy and completeness of your results and explanations.

    Below is the frequency table.Age (years).      Frequency20≤x<30           160 30≤x<40           130 40≤x<50           100 50≤x<60           115 60≤x<70           125 70≤x<80           135 The manager of a vacation resort believes that the ages of adult visitors to the resort can be modeled by a normal distribution. The manager surveyed a random sample of 765 visitors and recorded their age. A summary of the responses is shown in the frequency table, where x represents the age of the visitor.A.) Construct a histogram of the distribution of ages.B.)Write a few sentences to describe the distribution of ages of the adult visitors to the resort.C.)Does the histogram provide convincing evidence that the surveyed ages come from a normal distribution? Explain your answer

    1 AnswerMathematics2 months ago
  • I need help with a math question in my ap stats class, can anyone help me?

    Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods as well as on the accuracy and completeness of your results and explanations.

    A certain type of bird lives in two regions of a state. The distribution of weight for birds of this type in the northern region is approximately normal with mean 10 ounces and standard deviation 3 ounces. The distribution of weight for birds of this type in the southern region is approximately normal with mean 16 ounces and standard deviation 2.5 ounces.

    (a) Calculate the z -scores for a weight of 13 ounces for a bird living in the northern region and for a weight of 13 ounces for a bird living in the southern region.(b) Is it more likely that a bird of this type with a weight greater than 13 ounces lives in the northern region or the southern region? Justify your answer.

    3 AnswersMathematics3 months ago
  • Show all your work. Indicate clearly the methods you use, because you will be scored on the correctness of your methods. I need help asap!!!?

    Kathy and her brother Clay recently ran in a local marathon. The distribution of finishing time for women was approximately normal with mean 259 minutes and standard deviation 32 minutes. The distribution of finishing time for men was approximately normal with mean 242 minutes and standard deviation 29 minutes.

    a) The finishing time for Clay was 289 minutes. Calculate and interpret the standardized score for Clay’s marathon time. Show your work.

    (b) The finishing time for Kathy was 272 minutes. What proportion of women who ran the marathon had a finishing time less than Kathy’s? Show your work.

    c) The standard deviation of finishing time is greater for women than for men. What does this indicate about the finishing times of the women who ran the marathon compared to the finishing times of the men who ran the marathon?

    1 AnswerMathematics3 months ago