/**
Returns the normal deviate Z corresponding to a given lower tail area of P; Z is accurate to about 1 part in 10**16.

Wichura, M. J. (1988) Algorithm AS 241: The percentage points of the normal distribution. Applied Statistics, 37, 477–484.

extension of:
Beasley, J. D./ Springer, S. G. (1977), The percentage points of the NormalDistribution, Applied Statistics. 26, 118–121.

Excel: STANDNORMINV(); R: qnorm()
**/
export declare function normdev(p: number): number | false;
export declare function confidenceInterval(data: {
    x: number;
    y: number;
}[], predict: any, confidenceLevel: number): (x: any) => {
    x: any;
    left: number;
    right: any;
};