Daily spot exchange rates of US dollars per Pound Sterling during the most recent 10 days are given below. Days 1 2 3 4 5 6 7 8 9 10 Rate 1.82 1.83 1.81 1.84 1.86 1.83 1.84 1.78 1.79 1.82 (i) Use exponential smoothing with α = 0.1 and α = 0.3 (Set the initial forecast equal to the first actual data value). (ii) Compare standard errors for the two values of α. Which α can give a better forecast? Why? Make a one-period forecast using α with a better forecast.

Daily spot exchange rates of US dollars per Pound Sterling during the most recent 10 days are given below. Days 1 2 3 4 5 6 7 8 9 10 Rate 1.82 1.83 1.81 1.84 1.86 1.83 1.84 1.78 1.79 1.82 (i) Use exponential smoothing with α = 0.1 and α = 0.3 (Set the initial forecast equal to the first actual data value). (ii) Compare standard errors for the two values of α. Which α can give a better forecast? Why? Make a one-period forecast using α with a better forecast.

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter2: Exponential, Logarithmic, And Trigonometric Functions

Section2.CR: Chapter 2 Review

Problem 111CR: Respiratory Rate Researchers have found that the 95 th percentile the value at which 95% of the data...

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Respiratory Rate Researchers have found that the 95 th percentile the value at which 95% of the data are at or below for respiratory rates in breath per minute during the first 3 years of infancy are given by y=101.82411-0.0125995x+0.00013401x2 for awake infants and y=101.72858-0.0139928x+0.00017646x2 for sleeping infants, where x is the age in months. Source: Pediatrics. a. What is the domain for each function? b. For each respiratory rate, is the rate decreasing or increasing over the first 3 years of life? Hint: Is the graph of the quadratic in the exponent opening upward or downward? Where is the vertex? c. Verify your answer to part b using a graphing calculator. d. For a 1- year-old infant in the 95 th percentile, how much higher is the walking respiratory rate then the sleeping respiratory rate? e. f.
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