APPLIED STAT.IN BUS.+ECONOMICS
6th Edition
ISBN: 9781259957598
Author: DOANE
Publisher: RENT MCG
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Textbook Question
Chapter 14, Problem 15CR
(a) Explain how seasonal binaries can be used to model seasonal data. (b) What is the advantage of using seasonal binaries?
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ASSIGNMENT 4
9.84 Grey-Seal Nursing. The average lactation (nursing) period of
all earless seals is 23 days. Grey seals are one of several types of
earless seals. The length of time that a female grey seal nurses her
pup is studied by S. Twiss et al. in the article "Variation in Female
Grey Seal (Halichoerus grypus) Reproductive Performance Corre-
lates to Proactive-Reactive Behavioural Types" (PLOS ONE T7(11):
e49598. doi:10.1371/journal.pone.0049598). A sample of 14 female
grey seals had the following lactation periods, in days.
20.9
21.4
20.2
20.6
23.6
19.6
15.9
15.4
19.5
17.4
21.9
22.3
16.4
At the 5% significance level, do the data provide suficient evidence
to conclude that the mean lactation period of grey seals differs from
23 days? Assume that the population standard deviation is 3.0 days.
(Note: The sum of the data is 274.9 days.)
Part B
Pulmonary Disease
A study was performed looking at the effect of mean ozone exposure on change in pulmonary function. Fifty hikers were recruited into the study; 25 study participants hiked on days with low-ozone exposure, and 25 hiked on days with high-ozone exposure. The change in pulmonary function after a 4-hour hike was recorded for each
participant. The results are given in the table below. (Let population 1 be high-ozone exposure and population 2 be low-ozone exposure. Use high-low.)
Comparison of change in FEV on high-ozone vs.
low-ozone days
Ozone level Mean change in FEV*
High
H₁:
Low
USE SALT
0.102
0.049
sd
0.254 25
0.105 25
(a) What test can be used to determine whether the mean change in FEV differs between the high-ozone and low-ozone days? (You may need to use the Distribution Calculators page in SALT to check conditions.)
O paired t test
O F test for the equality of two variances
O two-sample t test for independent samples with equal variances
O two-sample t test for…
Chapter 14 Solutions
APPLIED STAT.IN BUS.+ECONOMICS
Ch. 14.2 - (a) Make an Excel graph of the data on the number...Ch. 14.2 - Prob. 3SECh. 14.2 - Prob. 4SECh. 14.2 - Prob. 5SECh. 14.4 - (a) Make an Excel line graph of the exchange rate...Ch. 14.5 - (a) Make an Excel line graph of the following bond...Ch. 14 - Explain the difference between (a) stocks and...Ch. 14 - (a) What is periodicity? (b) Give original...Ch. 14 - (a) What are the distinguishing features of each...Ch. 14 - Name four criteria for assessing a trend forecast.
Ch. 14 - Name two advantages and two disadvantages of each...Ch. 14 - When would the exponential trend model be...Ch. 14 - Explain how to obtain the compound percent growth...Ch. 14 - (a) When might a quadratic model be useful? (b)...Ch. 14 - Name five measures of fit for a trend, and state...Ch. 14 - Prob. 10CRCh. 14 - Prob. 11CRCh. 14 - Prob. 12CRCh. 14 - (a) Why is seasonality irrelevant for annual data?...Ch. 14 - Prob. 14CRCh. 14 - (a) Explain how seasonal binaries can be used to...Ch. 14 - What is the purpose of index numbers?Ch. 14 - (a) Make a line chart for JetBlues revenue. (b)...Ch. 14 - (a) Plot both Swiss watch time series on the same...Ch. 14 - (a) Make a line graph of the U.S. civilian labor...Ch. 14 - (a) Plot the voter participation rate. (b)...Ch. 14 - For each of the following fitted trends, make a...Ch. 14 - (a) Make a line graph of consumer credit...Ch. 14 - (a) Plot the data on U.S. general aviation...Ch. 14 - Prob. 17CECh. 14 - (a) Plot either receipts and outlays or federal...Ch. 14 - Prob. 19CECh. 14 - (a) Plot the data on leisure and hospitality...Ch. 14 - Prob. 21CECh. 14 - Prob. 22CECh. 14 - (a) Plot the data on skier/snowboard visits. (b)...Ch. 14 - Prob. 24CECh. 14 - (a) Plot U.S. petroleum imports on a graph. (b)...Ch. 14 - (a) Make a line chart and fit an m-period moving...Ch. 14 - Refer to exercise 14.26. (a) Plot the dollar/pound...Ch. 14 - (a) Plot the data on natural gas bills. (b) Can...Ch. 14 - (a) Plot the data on air travel delays. (b) Can...Ch. 14 - (a) Plot the data on airplane shipments. (b) Can...Ch. 14 - (a) Plot the data on revolving credit (credit...Ch. 14 - The following seasonal regression was fitted with...Ch. 14 - The following seasonal regression was fitted with...
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