You are planning to follow a group of weight loss challenge participants to determine the effectiveness of the program. Only six individuals have enrolled. Their beginning weights in pounds are 220, 225, 230, 233, 233, and 235. What is the range of weights?
What is prevalence?
In a bag containing 50 red, green, and blue marbles the marble color would be considered a
The following information was extracted from Table 2 in the MMWR article, Prevalence of healthy sleep duration among adults — United States, 2014 written by Liu Y, Wheaton AG, Chapman DP, Cunningham TJ, Lu H, Croft JB.
Two populations are evaluated for blood pressure and the relative frequency of the diastolic values are plotted on a graph. The graphs for the populations have a symmetrical distribution with the same mean; however, the graph for Population A has a very narrow peak while the graph for Population B has a wider base. Population A has
Statistical tests are conducted to determine the probability of observing a difference within a sample if no true difference exists within the population. Differences within a sample can occur through randomly for a variety of reasons including simple sampling errors. A random difference of 5% or less is not uncommon is generally not considered to be significant. Reporting this probability is the primary output of statistical tests and is known as a
Three hundred and fifty adult males with diabetes are classified by age and weight as follows:
Three hundred and fifty adult males with diabetes are classified by age and weight as follows:
Three hundred and fifty adult males with diabetes are classified by age and weight as follows:
A survey of 728 students at a local elementary school determined that half the students were boys and half were girls. Among the girls 49% are blondes, 3% are red-heads, 10% have black hair, and the remainder have chestnut- brown hair. Among the boys 40% are blondes, 2% are red-heads, 8% have black hair, and the remainder have chestnut-brown hair. What is the most commonly represented category of student in the school?
An incidence rate describes how quickly disease occurs in a population.
How do you calculate the prevalence of a disease?
An example of a type of variable is:
You recently collected frequency data for a semi-annual study about exposure to workplace noise exposure for adults from an audiology section of a corporate occupational medicine clinic. You have 1347 files, one for each employee working in an area with an exposure to ambient noise exceeding the OSHA threshold of 8-hour time-weighted average sound level (TWA) of 85 decibels. The initial analysis of data yields the following frequencies for the various variables:
Range is a simple measure of
In an outbreak of gastroenteritis among attendees of a corporate picnic, 99 persons ate potato salad, 30 of whom developed gastroenteritis. Calculate the risk (incidence proportion) of illness among persons who ate potato salad.
What is Healthy People?
You are given a bag containing 50 marbles. The marbles are red, or green. There is one blue marble in the bag. The odds of randomly picking a green marble from bag are 1:24. What is the ratio of green marbles to red marbles in the bag?
A variable….?
The likelihood of obtaining valid statistically significant results increases
You are planning to follow a group of weight loss challenge participants to determine the effectiveness of the program. Only six individuals have enrolled. Their beginning weights in pounds are 220, 225, 230, 233, 233, and 235. What is the mean value of participant weights?
The following data has been obtained from a community survey investigating the association of exposure to small particles from indoor wood fires for heating and cooking in Romania and development of chronic respiratory disease (COPD). The population of the Romanian town is 7300. A representative sample of 10% of the population was questioned. The sample included 500 people who use wood indoors for cooking and heating. The remainder do not use wood for either purpose. Exactly 90% of the people in the survey suffer from COPD. Among those with exposure to indoor wood burning on 2 people did not have COPD. Use a 2×2 table to evaluate the data and determine the number of people with COPD who were not exposed to indoor wood smoke.
You recently collected data for a semi-annual study about exposure to workplace noise exposure for adults from an audiology clinical file at the corporate occupational medicine clinic. You have 1347 files, one for each employee working in an area with an exposure to ambient noise exceeding the OSHA threshold of 8-hour time-weighted average sound level (TWA) of 85 decibels. The data are:
Public health surveillance …
On a symmetrical bell curve the midway point between the high and low values on the distribution represents the