3. An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools. Does this
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In different parts of the country, advertisements are placed with either the local TV or a local radio station. The length of the advertisements is characterized as short, medium or long. Each combination of media and
Hence, correlation alone is not causality, but can be considered as a determining factor. (Verma and Pearl, 1990)
According to Statistical Assessment Service (2012) under the sponsorship of George Mason University, “In general, we should all be wary of
But, how does a consumer know which one contains the lowest calorie among so many brands? That is why this assignment focuses on statistical evaluation of calories of breakfast cereals. This analysis will help a consumer to
The author states that the quantitative article used a simple random sampling method to determine the empirical value of various variables that relate to hypertension. Biophysical measures as a data collection method are used in the quantitative article because certain physical changes are subjected to measurement.
There is 95% confidence that the number of employees average is between 22.24 and 31.36.
The data consisted of ten points and was normally distributed. The lowest reported crime rate was 1.35 and the highest reported rate was 4.15. average crime
at +1, a coefficient variance of 0.75 indicates that there is a positive and strong linear-relationship between the credit balance and size of the holding.
A coefficient of determination (r2) normally explains the portion of fluctuation (variance) of a particular variable
This can be a threat to external validity in case when the participants of the experiment are aware of the experiment as compared to the situation where participants are not aware of the same. The results might have been different.
The major difference between the
Q6. Answer: d) Randomized controlled clinical trial It provides better evidence than the case control study or screening or cohort study because it provides causal effects inference than the other three approaches.
Q11. Answer: The most likely food that
A researcher asks whether attending a private high school leads to higher or lower performance on a test of social skills when compared to students attending public schools. A sample of 100 students from a private school produces a mean score of 71.30. The population mean (μ) for students from public high schools is 75.62.
There are numerous statistical methods available for forecasting and deciding on the significance of various scenarios. We consider the three techniques of hypothesis testing, parametric analysis and multivariate. These three are most of the time used together since they are just the components of probability analysis.
, The Bay Area Athletic Club can only expand the membership base other than increase the monthly rate in order to generate extra revenue (Somrack, 2005).The recommendations to the management of the club on to increase revenue collection include:
The management of the club
e selected group or sample, external validity refers to the degree to which the findings can be inferred to other settings such as a wider population or similar settings. An example of threat to validity is the “historical effect” confounds that affects an experiment
From these ANOVA table above, one can conclude that MS (ERROR) and MS (B) differ significantly because P-value=0.000000697 which is a figure less than alpha value of 0.05. Thus the null hypothesis can be rejected. Moreover, the table shows
Do you think the sample would have been randomly selected from this target population? Explain your answer. Yes. Every person in the city has an equal chance of being selected.As a result the random sampling will not be biased (Sweeney, et al., 2011, pp. 142-145)
The author states that yet another remarkable tendency of ratio measurements is that the ratio amongst two coefficients remains constant even though the units of measurement change. While the ratio has the benefit of being the pinnacle level of measurement, they cannot be used in every situation.
Other variables that might be associated with number of accidents include over speeding, driving under the influence of alcohol and other drugs as well as reckless driving. While rain is a natural factor, these other factors are caused by human initiatives. Driving while
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Social influence questions are mainly normally distributed. Normal Skewness shows that the participants’ distribution on the social influence questions were evenly distributed indicating values fairly resembling the mean. This shows that the participants were equally statistically significant in determining the outcome.
Similarly, students need to reach class in time and conveniently and this identifies need to understand the most appropriate types of transport. People’s opinions on available types of transport offers an insight into effectiveness, efficiency, and convenience of
e three types of presentation, “Any test presentation” was coded as 1, Technical Literature Review was coded as 2 and presentation on International business was coded as 3. The presenters were also coded such that 1 denoted male and 2 denoted female. On that note, this paper
If the process were repeated many times, each time selecting random samples of 500 people aged 20-24 and 450 people aged 25-29 and each time constructing a confidence interval for p1 - p2, 95% of the time the true difference between the two population proportions will lie
In the survey, 48 domestic (mean = 5.7708, standard deviation = 2.2993) and 169 international students (mean = 4.6923, standard deviation = 2.6748) responded to item five of the survey. This indicates that the international students’ response was a little lower than that
The researcher will select 20 nurses randomly out of the 75 nurses in the hospital; there is no method of selecting the nurses (Kothari, 2012).
This is where a researcher divides the entire population into
Despite being associated with several challenges, including fear of insecurity of personal data and theft of information leading to stealing of money. Nonetheless, uptake of the cashless payment system has been tremendous. The impacts of specific aspects (that could stand
This in turn gives first hand information required for the analysis.
Statistical analysis may be misused in cases where secondary data is used. This refers to a situation in which data is obtained from either reference books or the internet. Secondary data
The school management realized that the problem with the supply of these snacks was due to incompetence from the chefs and waste of time and labor when preparing them. The eight forms of waste were identified and were applied in solving the problem was solved. The
In the statistics class I learned the various statistical tools that are commonly used in a business or in research study so as to arrive at a particular outcome. Through this class my knowledge base has enhanced and now I am able to solve
This paper explores the t-tests and z-tests. Quality standards of control would be applied to the company in making sure that the shipments do not go out with any non-conformance. Hypothesis Test 2 Looking at Extrinsic satisfaction by positionHypothesis Test 2 Looking at Extrinsic satisfaction by position.
The author states that the five terms: quantities, scalars, vectors, velocities, and direction might seem self-explanatory to a mathematician, but for people, without a math background these terms might cause confusion. Thus examples must be given for everyone to understand vectors properly.
Researchers gather their data either on a behavioral checklist, test or instrumentation. On the other hand, it could also entail making visits to a research site wherein observations of participants may be