Severity: Warning
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Filename: drivers/Session_files_driver.php
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File: /home/answnniz/public_html/index.php
Line: 315
Function: require_once
Severity: Warning
Message: session_start(): Failed to read session data: user (path: /home/answnniz/public_html/system/sessions)
Filename: Session/Session.php
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File: /home/answnniz/public_html/index.php
Line: 315
Function: require_once
From a population that is not normally distributed and whose standard deviation is not known, a sample of 48 items is selected to develop an interval estimate for μ. Which of the following statements is true? a. The standard normal distribution can be used. b. The t distribution with 48 degrees of freedom must be used. c. The sample size must be increased in order to develop an interval estimate. d. The t distribution with 47 degrees of freedom must be used.