The synchronous speed (rpm) equals 60 times the frequency divided by the number of pole pairs. For 50Hz, a two-pole motor will have a synchronous speed of 3000 rpm, a four-pole motor of 1500 rpm.
The actual speed is a few percent lower due to the slip of the asynchronous motor.
The slip increases with the torque, typical values are 5–10%. The rated speed for a four-pole motor at 50Hz will thus be something like 1360 rpm. At no-load, the slip is very small.
Answer:
The store manager is 95% confident that the average amount spent by all customers is between $ 31.84 and $ 38.66.
Explanation:
In statistics, a confidence interval is the probability that the parameter of a population lies between two set of values when a random sample of the population is drawn for a specific percentage of times. This means that the confidence interval is formed about the whole population not the sample from which it is calculated.
The probabilities of a confidence interval can take any number, but 95% and 99% confidence level that are usually used.
It should be noted that, for example, 95% confidence level implies that there is a 95% chance that the true mean of the population lies within the calculated confidence interval.
Therefore, the statement which gives a valid interpretation of the interval in the question is the first one which states that "the store manager is 95% confident that the average amount spent by all customers is between $ 31.84 and $ 38.66."
I wish you the best.
Answer:
#1 = Web traffic is the amount of data sent and received by visitors to a website. This amount necessarily does not include the traffic generated by bots.
#2 = The three main traffic sources are direct, referral, and search, although your website may also have traffic from campaigns such as banner ads or paid search.
#3 = The time-on-page is simply the time difference between the pageview hit of the next page to the current page. In this scenario, the time-on-page will be “0” seconds since the person did not go to any other page.
#4 = When an employer taxes your bonus using the percentage method, it must identify the bonus as separate from your regular wages. The withholding rate for supplemental wages is 22 percent. That rate will be applied to any supplemental wages like bonuses up to $1 million during the tax year.
#5 = Exit rate as a term used in web site traffic analysis (sometimes confused with bounce rate) is the percentage of visitors to a page on the website from which they exit the website to a different website.
False, in developed nations labor costs are much much higher which is why labor is sent over to less developed countries
