Anna's students were not able to replicate the results of her published findings. in this scenario, anna has most likely committed the act of <u> observational </u><u>research</u><u>.</u>
An observational study draws from a sample of a population where the independent variable is not controlled because of ethical reasons and personal interference and sometimes constraints. The researcher therefore observes the population of choice without manipulation or interference.
A designed experiment is under controlled conditions, in which the researcher manipulates variables to determine a output and it constantly inputting things to improves the final result. Designed experiment is always under controlled environments with many things being anticipated or calculated.
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Answer:
1. Cotton Gin: In colonial times, cotton cloth was more expensive than linen or wool because of the extreme difficulty of separating seed from the clinging fibers. One man could pick the seeds from only about 1 pound of cotton fiber per day.
2. Reaper/Binder: Small grains had been harvested by hand for centuries, cut with sickles or scythes, hand-raked and tied into sheaves. Grain harvesting machines first appeared in Great Britain in about 1800, and in the U.S. a decade or two later, but most failed. Obed Hussey and Cyrus McCormick developed successful reapers during the 1830s.
3. Thresher: When grain was being cut by hand, the method for separating the kernels from the straw was equally slow and labor intensive. Grain was hauled to a barn where it was spread on a threshing floor and either beaten with hand flails or trampled by animals. That knocked the kernels free of the straw, which was then raked away. The remaining mixture was winnowed by tossing it into the air where the wind was relied upon to blow the chaff and lighter debris away from the heavier grain, which fell back onto the threshing floor.
4. Combined Harvester-Thresher: By the 1920s the steam traction engine was on it's way out, but it paved the way for the gasoline tractors that followed.
Explanation:
i have more like...
**Steam Engine**
**Auto Truck**
**Gasoline Tractor**
**General Purpose Tractor**
**Hydraulic Implement Lift with Draft Control**
8 in 1816 & 1820
16 in 1824 & 1828
21 in 1832, 1836 & 1840
23 from 1844 through 1860
21 in 1864 & 1868
22 in 1872, 1876 & 1880
23 from 1884 through 1908
24 from 1912 through 1928
26 in 1932, 1936 & 1940
26 in 1964 & 1968
25 in 1972, 1976 & 1980
23 in 1984 & 1988
21 in 1992, 1996 & 2000
20 in 2004 & 2008
18 in 2012, 2016 & 2020
25 from 1944 through 1960
Answer:
b. hedonic treadmill
Explanation:
Hedonic treadmill -
It refers to the human tendency to get back to a normal state of mind apart from being in some major negative or positive activity of the life, is referred to as hedonic treadmill.
Hence, from the given information of the question , Samer's experience is an example of hedonic treadmill.
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