# confidence level

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Related to confidence levels: confidence limit

## level

[lev´el]
relative position, rank, or concentration.
l's of care the six divisions of the health care system: preventive care, primary care, secondary or acute care, tertiary care, restorative care, and continuing care.
background level the usual intensity of a chemical or other stimulus in the environment.
confidence level the probability that a confidence interval does not contain the population parameter.
l's of consciousness see levels of consciousness.
lowest observed adverse effect level (LOAEL) (lowest observed effect level (LOEL)) in studies of the toxicity of chemicals, the lowest dosage level at which chronic exposure to the substance shows adverse effects; usually calculated for laboratory animals.
no observed adverse effect level (NOAEL) (no observed effect level (NOEL)) in studies of the toxicity of chemicals, the highest dosage level at which chronic exposure to the substance shows no adverse effects; usually calculated for laboratory animals.
level of significance a statistical measure that serves as the cutoff point used to determine whether a null hypothesis is retained or rejected; the probability of incorrectly rejecting the null hypothesis (see Type I error).
sterility assurance level (SAL) the probability that a process makes something sterile (see sterilization). An SAL of 10−6 is the recommended probability of survival for organisms on a sterilized device. This level means that there is less than or equal to one chance in a million that an item remains contaminated or nonsterile.

## confidence level

The probability associated with a confidence interval, and stated as a part of that interval.

## confidence

degree of assurance.

confidence interval
a range of values about a sample statistic that has a specified probability of including the true value of the statistic.
confidence level
1 minus the type 1 error; the probability that the trial under consideration will show no significant difference when there is in fact no significant difference between the treatments.
confidence limits
the highest and lowest values in a confidence interval.
References in periodicals archive ?
When compared to the US, business travelers in regions such as in Australia, Canada, France, Germany, Norway, Sweden, the UK and Singapore have lower confidence levels in how AI advancements can improve their business travel experiences in the future and they certainly think it is less likely that AI and VR will threaten mankind:
Given low business confidence levels, poor job creation prospects and with food inflation now set to increase significantly on the back of the drought-induced rise in domestic grain prices and extraordinarily weak rand exchange rate, consumer spending is expected to come under even more pressure in the first half of 2016," Loos said.
Mr Filice, who is a director of Cardiff estate agents Kelvin Francis, believes this flat start to the year explains the lower confidence levels here.
It shall correspond to the Value-at-Risk of the basic own funds of an insurance or reinsurance undertaking subject to a confidence level of 99,5 % over a one-year period.
The study, covering the period between 2007 and 2011, said consumer confidence levels have been extremely sensitive to political and security developments in the country.
Trevor Williams, chief economist at Lloyds TSB Corporate Markets, said: "Although confidence levels fell back at the end of the year, the context here is critical.
Simon Vaughan Johnson, the bank's head of commercial banking for the MENA region, said, 'We are seeing a slight dip in confidence levels quarter on quarter across the board, but we have not returned to the lows seen earlier in 2009.
A survey conducted by business adviser BDO, which looked at confidence levels in the sector over the next six months, showed 49.
In the September forecast, general and electrical machinery are projected to rise from 37 and 39 to 43 and 51, respectively but on the other hand, confidence levels in the services sector are expected to decline to 44.
The British Chambers of Commerce said there had been "welcome progress" in recent months, especially among confidence levels.
It is probable that clinical assessment of confidence levels of stroke survivors could provide an insight into factors that affect recovery, other than the pathological sequelae of stroke, and subsequently, the necessary interventions.
The UAE is among the top 10 countries in the Nielsen Consumer Confidence Index, a survey that tracks consumer habits, concerns and confidence levels among 26,202 internet users in 52 countries.

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