fortdefruitI
2020-10-26
Answered

What is data modeling? What is its primary tool?

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asked 2021-01-06

A weather forecaster predicts that the temperature in Antarctica will decrease ${8}^{\circ}F$ each hour for the next 6 hours. Write and solve an inequality to determine how many hours it will take for the temperature to drop at least ${36}^{\circ}F$

asked 2021-02-25

Aurora is planning to participate in an event at her school's field day that requires her to complete tasks at various stations in the fastest time possible. To prepare for the event, she is practicing and keeping track of her time to complete each station. The x-coordinate is the station number, and the y-coordinate is the time in minutes since the start of the race that she completed the task. $(1,3),(2,6),(3,12),(4,24)$

Part A: Is this data modeling an algebraic sequence or a geometric sequence? Explain your answer.

Part B: Use a recursive formula to determine the time she will complete station 5.

Part C: Use an explicit formula to find the time she will complete the 9th station.

Part A: Is this data modeling an algebraic sequence or a geometric sequence? Explain your answer.

Part B: Use a recursive formula to determine the time she will complete station 5.

Part C: Use an explicit formula to find the time she will complete the 9th station.

asked 2020-11-20

The article “Modeling Sediment and Water Column Interactions for Hydrophobic Pollutants” (Water Research, 1984: 1169-1174) suggests the uniform distribution on the interval (7.5, 20) as a model for depth (cm) of the bioturbation layer in sediment in a certain region. a. What are the mean and variance of depth? b. What is the cdf of depth? c. What is the probability that observed depth is at most 10? Between 10 and 15? d. What is the probability that the observed depth is within 1 standard deviation of the mean value? Within 2 standard deviations?

asked 2021-03-07

A parks and recreation department is constructing a new bike path. The path will be parallel to the railroad tracks shown and pass through the parking area al the point $(4,\text{}5).$ Write an equation that represents the path.

asked 2021-01-05

In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give example of population members that might have been omitted.

a) The population consists of all 250 students in your laege statistics class. You plan to obtain a sample random sample of 30 students by using the sample frame of students present next Monday.

b) The population consists of all 15-year-olds living in the attendance district of a local high school. You plna to obtain a simple random sample of 200 such residents by using the student roster of the high school as the sampling frame.

a) The population consists of all 250 students in your laege statistics class. You plan to obtain a sample random sample of 30 students by using the sample frame of students present next Monday.

b) The population consists of all 15-year-olds living in the attendance district of a local high school. You plna to obtain a simple random sample of 200 such residents by using the student roster of the high school as the sampling frame.

asked 2021-03-02

An experiment designed to study the relationship between hypertension and cigarette smoking yielded the following data.

Test the hypothesis that whether or not an individual has hypertension is independent of how much that person smokes.

asked 2021-10-27

Which of the following is nota condition for constructing a confidence interval to estimate the difference between two population proportions?

A. The samples must be selected randomly.

B. The data must come from populations with approximately normal distributions.

C. When samples are taken without replacement, each population must be at least 10 times as large as its corresponding sample.

D. The samples must be independent of each other.

E. The observed number of successes and failures for both samples must be at least 10.

A. The samples must be selected randomly.

B. The data must come from populations with approximately normal distributions.

C. When samples are taken without replacement, each population must be at least 10 times as large as its corresponding sample.

D. The samples must be independent of each other.

E. The observed number of successes and failures for both samples must be at least 10.