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Which of the following statements relating to correlation and reegression are true?
1. The coefficient of correlation is independent of change of origin and scale
2. The coefficient of correlation between the two variables is the arithmetic average of the two regression coefficients
3. The probable error of the coefficient correlation is 0.6745 times of its standard error
4. Coefficient of correlation multiplied by the ratio between the standard deviations of the two variables denotes the slope of the regression line
Select the correct answer:
The ratio of iPhone users to Oneplus users is 4 ∶ 5 and the ratio of Oneplus user to Xiaomi users is 6 ∶ 7. If iPhone users increased 25%, Oneplus users increased in the ratio 3 ∶ 4 and the Xiaomi increased by 20%. What is the ratio of iPhone, Oneplus and Xiaomi users after increased?
If the number of Facebook, Instagram and twitter users are in the ratio 2 ∶ 3 ∶ 4. If Facebook users increased in the ratio 3 ∶ 4, Instagram users increased in the ratio 2 ∶ 3 and twitter users increased in the ratio 5 ∶ 6. What will be the new ratio of respective social website users after increments?
Five Lakes Publishing has a Windows 2000 network serving 200 users. A server named User_srv is used to hold users' files. User_srv is configured with a single, large NTFS volume. Every user has a home folder on User_srv. Users can also use a shared folder named IN_PROGRESS to store files for books that are being prepared. The network administrator at Five Lakes Publishing configured disk quotas for the NTFS volume on User_srv. All users have a default limit of 100 MB, and the option to deny space to users who exceed their limit has been enabled. When a user named Amy Jones attempts to save a chapter of a new book to her home folder on the server, she receives the following error message: "The disk is full or too many files are open." What should Amy do to allow this document to be saved?
Which of the following statements are true? a. The correlation coefficient is dependent on the choice of both origin and scale observations. b. The correlation coefficient is dependent on the units of measurements. c. The coefficient of correlation is the square root of the coefficient of determination. d. The zero value of the correlation coefficient cannot estimate the value of the dependent variable.
Four friends A, B, C and D need to cross a bridge. A maximum two persons can cross it at a time. It is night and they just have one lamp. Persons that cross the bridge must carry the lamp to find the way. A pair must walk together at the speed of slower person. After crossing the bridge, the person having faster speed in the pair will return with the lamp each time to accompany another person in the group. Finally, the lamp has to be returned at the original place and the person who returns the lamp has to cross the bridge again without lamp. To cross the bridge, the time taken by them is as follows: A :1 minute, B : 2 minutes, C : 7 minutes and D : 10 minutes. What is the total minimum time required by all the friends to cross the bridge?
In Delhi - NCR, out of the total metro card users, 12% live in Noida, 9% live in Ghaziabad, x% live in Gurugram and rest live in Delhi. The ratio of number of male and female metro card users which are residents of Noida is 6 ∶ 5. Find the value of x, if there are 22500 female users of the metro card in Noida and Delhi has 222750 more users than Ghaziabad.
You are the administrator of the Windows 2000 Server network shown in the exhibit. Users in the Research group and the Executive group have permission to access the Internet through a Windows 2000 Server computer running Microsoft Proxy Server. These users must enter their proxy server user names and passwords to connect to the proxy server, to the Internet, and to your local intranet server. The users who do not access the Internet do not have user accounts on the proxy server and, therefore, cannot connect to the intranet server. You want all users to be able to connect to the intranet server without entering a separate user name and password. What should you do?
You are the administrator of a Windows 2000 Server computer named Intra. Intra is a member of an Active Directory domain and hosts an Intranet Web-Ske for your company. Company policy requires that only authenticated users have access to the intranet site. All company users have a user account in the Active Directory domain. You configure directory security for the Web Site to use integrated security. However, you discover that users can access the Web Site without authentication. You need to ensure that only authenticated users can access the web site. What should you do?
Consider the following statements regarding Time-Division Multiplexing (TDM): 1. The information from different measuring points is transmitted serially on the same communication channel. 2. It involves the transmission of data samples rather than continuous data transmission. 3. It is especially useful when telemetering fast-changing, high bandwidth data. Which of the above statements are valid in respect to TDM?